Question about 1991 Isuzu Rodeo

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Adjusting fuel pump - 1991 Isuzu Rodeo

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If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.

Posted on Jul 12, 2009

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I had my 50psi fuel pump rebuilt cause of a bad mother board in pump they tested it sent it back now my circuit breaker blows when i hit the gas is my circuit breaker badd now


Unlikely the breaker is faulty, but it is possible.

Most likely the pump is consuming too much current or more current than the breaker is designed to cope with.

A fuel pump is simply a pump driven by a motor that is designed to provide a greater volume of fuel than the engine could ever need right from the initial startup to maximum load and speed. It is the fuel pressure regulator that provides the chosen fuel line pressure and fuel constantly circulates at that pressure therefore the current the pump motor consumes remains constant regardless of the engine speed or load.

Should there be a fuel line blockage, for instance, any healthy pump will be capable of generating a pressure sufficient to burst many types of fuel hose/pipe and it is only when something like that happens or an adjustable fuel pressure regulator is used that is adjusted for a greater than design pressure that the pump will work harder and consume more current.

I suggest you check the fuel line pressure and adjust or replace the regulator if it is significantly higher than specification and then measure the current being consumed by the pump if the breaker is still tripping. If the current is within limits replace the breaker and if the current is excessive you should seek guidance from the people who rebuilt it.

Aug 21, 2017 | Cars & Trucks

4 Answers

Why won't car stay running unless I keep pumping the gas pedal


Sounds like a fuel pump issue. Check the pressure from the fuel pump.

Mar 08, 2015 | Cars & Trucks

1 Answer

1995 ford escort keeps burning up fuel pumps they get hot and quit I put a air tech pump in bosch in I replaced filter now a relay and fuel pressure regulator if its got one is the next step any ideas


Sounds like a bad pressure regulator. The regulator is suppose to adjust the pump speed to match demand. Some units work by counting the RPM with a crankshaft sensor. Check fuel pressure at test port. Sometimes the pressure needs to be adjusted when changing a pump.

Jul 27, 2014 | 1995 Ford Escort

1 Answer

How to change 1984 chrysler new yorker 2.6l from an electric fuel pump to a mechanical fuel pump.


Replace the mechanical pump with a new unit and that will remove any reason of broken/failure from the equation. Remove the electric pump altogether and leave 1 filter in the line before the mechanical pump. Mechanical pumps are not in favour with some people who have no idea that they can be adjusted to give more pressure and greater volume for the bigger capacity engines. Some mechanical pumps are more expensive to repair / replace but if you price an electric pump to supply the volume that a properly adjusted or a larger capacity mechanical pump then the cost saving is minimal. Unless you get a fuel filter that is rated with a smaller micron rating than the standard filter any number of filters will not work as the smallest particle will get through the lot

Nov 21, 2013 | Cars & Trucks

1 Answer

No power after 4000 rpms


This sounds like a fuel pump or fuel filter problem.
The 1988 Jetta has two fuel pumps. The "main" one under the car directly in front of the gas tank on the right hand side. The other fuel pum is in the tank. You can access that fuel pum by removing the round access panel in the trunk towards the back seat.

You'll need a fuel pressure gauge. You can usually borrow one from a large auto parts chain store.

FUEL DELIVERY & SYSTEM PRESSURES
System Pressure
Connect Pressure Gauge (VW 1318) between line from fuel distributor to cold start valve and
test port connection on lower chamber of fuel distributor, using Adapter Fittings (VW 1318/5).
Test port is sealed by a threaded plug. Bridge fuel pump relay with Jumper Switch (US 4480/3).
1.
Disconnect wiring from Differential Pressure Regulator (DPR). Open valve on pressure gauge
(points at cold start valve line when open) and activate fuel pump. System pressure must be 75-
82 psi (5.3-5.8 kg/cm2 ). If pressure reading is low and fuel pump delivery quantity is good,
replace pressure regulator.
2.
If pressure reading is high, disconnect fuel tank return line from DPR. Repeat test. If reading is
correct, check for plugged return line. If reading is incorrect with line open, replace DPR.
3.
Differential Control Pressure
Close valve on pressure gauge. Activate fuel pump with jumper switch. Leave DPR
disconnected. DPR reading should be 2.9-7.0 psi (.2-.5 kg/cm2 ) less than system pressure. If
pressure is incorrect, disconnect lower chamber return line and measure volume.
1.
Close open port to diaphragm pressure regulator. Activate fuel pump with jumper switch. Fuel
volume should be .14-.16 qts. (.13-.15L) for period of one minute. If volume is correct, replace
DPR. If volume is incorrect, replace fuel distributor.
2.
Close valve on pressure gauge. Install Test Harness (1315A/1) between DPR and vehicle
harness. Set multimeter to DCA 200 mA scale. Connect multimeter to test harness. Disconnect
wiring to coolant temperature sensor. Connect 15 k/ohm side of Test Resistor (VW 1490) to
sensor wiring.
3.
Turn on ignition and fuel pump. Differential pressure should be 10-17.5 psi (.7-1.2 kg/cm2 )
less than system pressure. DPR current should be 50-80 mA. If pressure is incorrect and current
is correct, replace DPR.
4.
If both pressure and current readings are incorrect, remove test harness from DPR. Ensure
resistance of DPR is 17.5-21.5 ohms. If reading is incorrect, replace DPR.
5.
If reading is correct, check ground from temperature sensor to cold start valve. If ground is
good, check power supply fuse. If fuse is okay, check terminals on ECU connector. If connector
is okay, replace ECU.
6.
Residual Pressure & Internal Leak Testing
Open valve on pressure gauge. Operate fuel pump for 30 seconds. Pressure can drop to a
minimum of 38 psi (2.7 kg/cm2 ) after 10 minutes. If pressure drops below specification, inspect
fuel pump check valve and all fuel fittings for leakage.
1.
NOTE: Pressure and leak testing does not include checking cold start
valve.
FUEL INJECTION SYSTEM - BOSCH CIS-E -1988 Volkswagen Jetta Page 1 of 3
http://www.ondemand5.com/mric/common/asp/printart.aspx 11/25/2011
If there are no leaks, check airflow sensor plate clearance. If plate clearance is correct, replace
diaphragm pressure regulator and repeat leak test. If pressure drop is not within specification,
replace fuel distributor "O" rings.
2.
Transfer Pump Delivery Volume
Check voltage supply to pumps. Connect Jumper Switch (US 4480/3) in place of fuel pump
relay, on relay panel. Remove fuel filler cap. Disconnect and plug off Black fuel line from
sending unit.
1.
Connect hose to sender port and place in measuring container. Turn on fuel pumps. Minimum
transfer pump delivery volume should be .42 qts. (.4L) in 10 seconds. Reconnect fuel line to
sender.
2.
Main Pump Delivery Volume
Check transfer pump (if equipped) and fuel filter. Disconnect fuel return line and place in
measuring container. Switch on fuel pump with jumper switch. Check fuel pump delivery
volume for 30 second period. Delivery rates are given with voltage reading at pump as volume
will change with different voltages.
1.
Minimum delivery volume for Fox, Quantum and Quantum Syncro models is .71 qts. (.68L) for
30 seconds with reading of 11.4 volts at fuel pump. Minimum delivery volume for other models
is .62 qts. (.59L) with 11.4 volts at fuel pump.
2.
Fuel Distributor
Check sensor plate adjusting lever and fuel distributor control piston for smooth operation.
Disconnect fuel injector lines at fuel injectors.
1.
Remove fuel pump relay and bridge fuel pump circuit. Use Jumper Switch (US 4480/3) in place
of fuel pump relay. When pressure has built up, turn off fuel pump. Move sensor plate from rest
position to end of travel.
2.
Uniform resistance should be felt during entire movement. No resistance should be felt on
quick return to rest position. Connect injector lines. Install fuel pump relay.
3.
Injector Quantity Comparison
Remove fuel pump relay, from relay panel, and install Jumper Switch (US 4480/3) in off
position in place of relay. Attach Fuel Quantity Analyzer (US 4480) to bumper and secure in
place. Remove injectors from cylinder head with fuel lines attached. Check and replace fuel
injector "O" rings as necessary.
1.
Check tightness of injector insert (2-piece inserts). If inserts are loose, remove and clean
threads. Use sealing compound when installing upper insert. Replace sealing washer that goes
against cylinder head below lower portion of insert. Lubricate injector "O" rings with gasoline
and install injectors, with fuel lines connected, into fuel quantity analyzer tubes.
2.
Ensure lines are not kinked or bent. Loosen fittings to align fuel lines and retighten. Remove
rubber boot from airflow sensor housing above sensor plate. Turn and lift setting screw and
adjusting slide of Sensor Plate Adjustable Holder (VW 1348/1) into upper position. This
simulates full throttle operation. See Fig. 11 .
3.
FUEL INJECTION SYSTEM - BOSCH CIS-E -1988 Volkswagen Jetta Page 2 of 3
http://www.ondemand5.com/mric/common/asp/printart.aspx 11/25/2011
Fig. 11: Sensor Plate Adjustable Holder (VW 1348/1)
Courtesy of AUDI OF AMERICA, INC.
Place sensor plate adjustable holder on airflow sensor housing with holder centered over plate.
Pointer on edge of holder base must point toward center of fuel distributor. Push adjusting slide
of holder down onto stop.
4.
Turn adjusting screw clockwise until magnetic end touches sensor plate retaining bolt. Activate
fuel pump with jumper switch. Turn adjusting screw of holder counterclockwise until any one
injector starts to deliver fuel. Turn off jumper switch and empty fuel quantity analyzer after
taking sample.
5.
Idle injection quantity is measured first. Lifting adjusting slide of holder to first stop simulates
idle position of sensor plate. Activate fuel pump until fuel level reaches 20 ml on scale of any
tube.
6.
Check that all injectors have identical spray patterns that are even and cone-shaped. If not, raise
sensor plate up quickly to full lift position and release. Repeat idle quantity test. Compare
amounts of fuel delivered by all injectors with analyzer held level. Maximum difference in
delivery quantity between injectors is 3.0 ml of fuel.
7.
If fuel delivery quantity differs between high and low levels by more than 3.0 ml, interchange
injectors and repeat test. If difference of delivery quantity changes with injectors, replace
injectors. If difference of delivery quantity does not change with movement of injectors, either
fuel lines are pinched or fuel distributor is defective.
8.
Measure full throttle injection quantity. Empty analyzer into fuel tank and reinstall injectors in
analyzer. Lift adjusting slide of holder to last stop to simulate full throttle position of sensor
plate. Activate fuel pump with jumper switch until fuel level reaches 80 ml on scale of any tube
of analyzer.
9.
Check that all injectors have identical spray patterns that are even and cone-shaped. If not, raise
sensor plate up quickly to full lift position and release. Repeat full throttle quantity test.
Compare amounts of fuel delivered by all injectors with analyzer held level. Maximum
difference in delivery quantity between injectors is 8.0 ml of fuel.
10.
If fuel delivery quantity differs between high and low levels by more than 8.0 ml, interchange
injectors and repeat test. If difference of delivery quantity changes with injectors, replace
injectors. If difference of delivery quantity does not change with movement of injectors, either
fuel lines are pinched or fuel distributor is defective.
11.
Check fuel injectors for leakage immediately after delivery quantity test is complete. Set sensor
plate in rest position. Activate fuel pump with jumper switch for 2 minutes. Injectors should not
drip. Replace injectors that drip.
See image. Fuel filter is probably located on the frame between the engine and fuel tank.
8_24_2012_11_36_10_pm.jpg8_24_2012_11_36_30_pm.jpg

Jul 03, 2012 | 1988 Volkswagen Jetta

2 Answers

Fuel Pump Is In Gas Tank. Vehicle Starts Running Poorly...


First, I have never seen an S-10 Blazer that is carbureted and equipped with an in-tank fuel pump and a fuel pressure regulator. Are you sure you are not talking about a throttle body injected engine?

Then, even if such a vehicle does exist, it would make sense to me that the pump is either capable of producing the pressure or it is not. If it adjusts to where you want it, it would make sense to me that the pump is doing what it is supposed to do. Adjusting the regulator would not cause the pump to pump more. It would only affect how much of what the pump is pushing gets returned to the tank. On the other hand, a hole in a regulator diaphram that keeps getting larger could easilly cause the symptoms you are describing.

Apr 14, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

Transit pump code p0216 how can i fix this


P0216 DTC - Injection Timing Control Circuit Malfunction and this means the diesel fuel injection pump has a timing failure. This could be that the injection pump timing needs adjusted OR the failure is internal to the injection pump and therefore non-adjustable.

NOTE: If your vehicle is a Dodge Ram with Cummins engine then be aware that fuel delivery problems frequently cause this code. Prolonged fuel delivery problems can cause injection pump failure!

Symptoms of a P0216 DTC may include:
Low power
Crank, but no start
Hard start
Displays an intermittent stumble or miss
Engine may start and then stall
Engine may appear to drive fine but surge at idle


The most frequent cause of this code is a bad injection pump due to poor fuel delivery. Fuel delivery problems could be:
A plugged diesel fuel filter
An in-tank blockage
Air in the fuel due to a cracked in-tank fuel ine above the fuel level
Bad transfer (lift) pump
Injection pump out of time


Possible Solutions: First, simply check if your injection pump timing is adjustable. If so, check the timing and adjust if necessary.

If you think that you may have a fuel delivery problem, then check the lift pump operation. On Dodge Ram with the Cummins engine, the lift pump should produce about 45 oz of diesel in 25 seconds of operation. This can be performed by disconnecting the fuel hose from the injection pump and pumping the fuel into an approved container. Bump the engine over but do not start it. Then the lift pump will operate for 25 seconds. If the fuel is aerated, then check/repair fuel line and recheck.

With the fuel hose connected the fuel pressure should be 10psi. If the fuel delivery tests fail, replace the diesel fuel filter and recheck.

If it still fails then verify there are no restrictions in the fuel tank

Then replace the lift (transfer) pump. IT SHOULD BE NOTED that if this code surfaced after a routine fuel filter replacement or if you have any of the above symptoms after routine fuel filter replacement, then suspect the fuel transfer pump. This occurs because even a weak transfer pump can still provide enough fuel for the engine to run. But when the fuel system\'s prime is lost due to fuel filter replacement, it may not restart again without fixing the fuel delivery problem.

If you found your injection pump to be bad, the lift pump should be checked for operation to protect the new injection pump. This is because weak or low output from lift pump are common cause of injection pump failure. There are some aftermarket kits that can be purchased to warn the operator when the fuel pressure/volume drops to level that could damage the injection pump.

Hope this helps (remember to rating this free answer and leave a testimonial comments).

Oct 11, 2011 | Cars & Trucks

2 Answers

On first crank fuel pump doesnt hold pressure and has to be cranked on for several seconds


sounds like its not working properly, the fuel pump pumps or it does't, then goes to regulator this is where pressure is adjusted. check fuel pressure with gauge, sometimes even new fuel pumps don't pump enough fuel. most fuel injected cars have over 50 pounds pressure.

Mar 15, 2011 | 1999 Pontiac Sunfire

1 Answer

93 voyageur keeps stalling?


The owner should locate the fuel pump first before servicing . prepare the equipment to use in servicing the the fuel pump.The owner of the car should adjust the the Idle. Start the car and check the fuel pump Idle and adjust until the car can drive when it is place into gear.the problem in the car is in the Idle, it means that there is low fuel passing to the fuel pump, that is why the car when it drives or the strength of the car is low when placed into drive. there fore adjusting the Idle until the car will drive when placed into gear is the solution.If the owner don't have time to do it then the owner of the car should go to a car mechanic to do the task or job.

Sep 27, 2009 | 1993 Plymouth Voyager

1 Answer

Fuel pump on the outside of tank


Use can use a universal pump but you have to look in the book to find out what the fuel pressure was supposed to be of the original pump. I do not have these specs off the top of my head. Once you know what the fuel pressure was supposed to be you can purchase the corresponding pump that is close and mount it in place of the old one. You can also get ones that are adjustable. These are adjustable within reason - say 10-15lbs.

Jun 08, 2009 | 1983 Nissan 280ZX

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