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I unplugged 2 relays green base and black base. With key on I had pulsating power coming threw the low pressure in tank fuel pump wires. And the same with relays plugged in on a 89 ford econo 350 7.5L

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6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 833 Answers

SOURCE: 1995 Buick Regal- No Fuel pressure due to no power to relay

Best place to get that may be your public library.  Many have the Mitchell electrical manuals in stock.

Posted on Nov 23, 2008

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dealt_soul
  • 296 Answers

SOURCE: 87 ford f-150 4.9 L. v6 fuel system

If you hear the relay click, but no pressure at all then it would be the fuel pump needing replacement

Posted on Feb 16, 2009

daves944
  • 1050 Answers

SOURCE: Buick Regal dying

You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

Posted on May 11, 2009

emissionwiz
  • 76649 Answers

SOURCE: 1991 ford f-150 fuel pump will not come on

remember the switch only gets power for 1 second when u turn the key on, the common problem is the ignition starter switch comes apart, it is located at top of the steering column near the bottom, drop the column down (2 nuts) and inspect the switch for separation.

Posted on Jul 27, 2009

  • 1 Answer

SOURCE: Fuel pump problems

you have a shut off button in the trunk find it turn it off and turn it back on

Posted on Nov 25, 2009

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1 Answer

No fuel. pulled off fuel line to carb and cranked engine no fuel coming out. Relay under dash working. No sound at fuel tank when key is turned on. Are there any other fuses or relay for fuel system?


Check for power output at the relay, there should be a pink wire with a black stripe that connects to the fuel pump relay, when the key is turned on it should have 12 volts for a few seconds, then drop to 0 volts. This is the prime function that builds fuel pressure before you start the engine. Even though it clicks it doesn't mean it works - the contacts could be bad. This wire continues straight back to the pump, if it has power there may be a damaged wire between the relay and the pump or a bad pump - the pump is fairly common on these vehicles.

These pumps last longer if you don't run less than 1/4 tank of fuel - keeps them cooler.

Sep 29, 2015 | 1994 Geo Tracker

1 Answer

Will not start will crank will start with starting fluid but when quit spraying eng quits


`Probably the fuel pump in the tank has stopped working. Verify with a check for power at the gas tank connector: When the engine is cranking, the fuel pump wire should have power on it-use a test light or voltmeter. If the wire has power, but pump will not turn on, the gas tank will have to be removed to replace the pump.
Just by turning the key to on, not start, will or should cause the fuel pump to come on for about 2 seconds to pressurize the fuel lines and put gas under pressure against the fuel injectors. If you don't hear the pump buzz on for a brief time, you know you need to check the fuel pump circuit. Check fuse, check fuel pump relay...but the easiest way to verify a bad pump is to check fuel pressure, or check for power at the gas tank when the engine is cranking. No power is a fault in the circuit (fuse, relay, wiring), power available to the pump but no pump means the pump will have to be replaced .

Oct 17, 2013 | 2001 Ford Windstar

1 Answer

I need a gmc safari diagram for fuel pump 1991


I don't usually do diagrams due to copyright laws.
From the fuel pump you have a gray wire and a black wire.
The black is ground and the gray is power from both the pump relay and the oil pressure switch.
The oil pressure switch provides power to the pump once the engine starts.
At the relay, you have a green and white wire that provides power from the ECM with the key switch on. You have an orange wire that provides power from a 15amp fuse.
The gray wire going to the pump, and a black and white wire for ground for the relay.
The ECM provides power for 3 seconds when the key switch is turned on to boost line pressure for startup.

Jan 30, 2013 | 1997 GMC Safari

1 Answer

1987 Jeep Cherokee-4.0L I6 auto tranny 4WD. Fuel pump will engage if straight wired but not if plugged in, engine will crank but not turn over, checked all relays & relaced battery cables &...


If you turn on the key and you do not hear the pump in the tank running for two secounds ( the same time your warning lights on your dash light up and goes off) then 1 you need to replace the pump or 2 it has low voltage to the pump or 3 both. I just repaired a 1987 pioneer what you need to know is the pump requires 12v at the pump, however OEM has placed an inline ballast resistor located on the driver side front engine compartment near the hood latch that is made of white ceramic with two connection both wires are orange with a black stripe. A. Check the voltage on both sides of the resistor 12v in 12v out use a volt meater - to battery + to resister if no voltes check the relay the passenger side of the engine compartment ( there is 4 relays from front to back it is no. 2 from the battery) looks like a small blue box newer relays are black, if they do not click when the key is on then your CPU may be bad or fusible link is bad If you have voltage to the resister and you have 12v in and less than 12v out your next test will be at the rear connector to the pump, three wires close to the fuel filter using a volt meater check the black wire with the orange / black stripe if voltage is less than the voltage out of your resistor then there is a bad wire in the system and a new wire is required. confirm this by jumping the battery to the pump wire black to- and orange to + the pump should run. Note. running the pump with lower than 12v will damage the pump and cause it to fail! If the pump works you can check the fuel pressure on the fuel rail, remove the cap to epose the shearder valve (looks like the valve on your tires) depress the valve stem and fuel should come out, caution fuel is under pressure have a rag under the valve to catch the fuel, if low pressure the pump is bad and/or filter is plugged Replace filter first recheck this test then replace pump and recheck. Note!!! when the pump is out of the tank recheck the voltage at the pump this will show true voltage at the last connector it needs to be 12 volts! Reconnect the pump wire the stock wire and check, on the pioneer I worked on was 4 volts so I rewired it to a new battery source using the orange /black strip wire that had 12v in to resistor as a trip wire for a 65 amp power relay. The owner noted an increase in overal performance " it now has more power now" hope this helps

Feb 23, 2011 | Jeep Cherokee Cars & Trucks

1 Answer

1996 olds 88 3.8 engine starts up runs about 15 minutes then shut down.Wait a while and will do same cycle over. I replace fuel pump, filter tank clean. No codes, engine runs find until it stops getting...


There is a fuel pump prime cycle (2 or 3 seconds)when you turn the key to on and once you start the engine the fuel pump power comes though the oil pressure switch.No oil pressure,no power to the pump.maybe your oil pressure switch has become weak?I would use a scan tool and command the fuel pump on when it does shut off,just to make sure the pump can run,as it could be a bad pump too.Also when it does quit,if you turn the key off for 10 seconds, you should get a prime cycle by turning the key to on.Have someone listen at the gas tank for a fuel pump noise,which will be only 2 or 3 seconds,but will do as a pump running check.Next would be to check for power at the back at or near the fuel pump,power and no pump.replace pump.No power to pump,follow power back to the front through oil pressure switch and fuel pump relay etc.You can always add your own power to the pump from a power source the switches off with the key if needed bypassing the existing wiring and oil pressure switch.

Mar 15, 2017 | 1996 Oldsmobile 88

3 Answers

Truck will not start, has fire. relay ok. no trouble codes.


when you turn the key in 'on' position, do you hear the fuel pump hum? check under hood in black box,,fuses,,and relays. for bad fuse or fuel pump relay bad. try bumping fuel tank with something hard to see if fuel pump will engauge with key on. maybe bad pump. have you had off road? look for pulled plug from fuel pump underneath near gas tank.have you bent or damaged your igbition key somehow? the key sends a signal to your cars computer to engauge the pump and crankshaft sensor.but if you do have fire,,,it's a fuel problem, so you are on the right track. if nothing i've said helps, check for a bad fuel pressure regulator.hope this helps and thank you for choosing fixya.com!!

Nov 19, 2010 | 2001 Dodge Durango

2 Answers

How do i check the fuel pump relay and the fuel pump to see which is the bad part on a 99 Yukon 4x4, 4 door model?


The fuel pump relay should have a schematic on it so you can check it with an ohm meter for a short. If it checks ok and when you turn the key on, you do not hear the pump then replace the pump

Apr 28, 2010 | 1999 GMC Yukon

3 Answers

My stock honda key turns over the engine, i have spark, no fuel is being delivered to start engine. what could be wrong? is there a fuel flip switch anywhere?


won't claim as a solution but...

Have you verified that fuel is pupming (is the fuel pump working?)

there is a pressure regulator on the end of the fuel rail that is vaccuum activated.... is thier vaccuum getting to it to create pressure for the injectors..

Just s few items to check....

Mar 09, 2010 | 1997 Honda Prelude

3 Answers

Electrical problem 89 gmc pickup


You could always run a fused wire from the fuse panel to the relay. This way when you turn the key, power goes to the accessory on the fuse panel, the fused wire you installed, and to the relay circumventing the problem and creating a protected circuit.

Feb 27, 2010 | 1989 GMC Sierra

1 Answer

Keeps blowing ECM1 fuse


The first thing you should do is to locate the oil pressure switch/sending unit.

This switch serves two functions.

1) provide oil pressure reading

2) disable the fuel pump relay in event of oil pressure loss.

===

When this switch is failing to provide the correct pressure to the ECU. The wiring harness can overheat and eventually create a short.

ECM1 fuse blow is because the harness is grounding/shorting.

===

DO NOT drive the truck until you change the oil pressure switch.

After you change the switch,you should spend sometime to inspect the wiring between the fuel pump relay,ECU and fuel pump.


Please post up day on the comment window/page.

I will follow up on it later.


Good luck.

Jun 27, 2009 | 1991 GMC Sonoma

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