Question about 1990 Plymouth Voyager

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It there power to a fuel pump at all the time

We are not getting fuel to the engine. Change the fuel relay box out and still no fuel coming to the engine. We do have power to the fuel pump for couple of sec. I do not know who to check the fuel pump out. I think it is the fuel pump but I can not prove it.

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If there is power to the pump and it still won't start, it sounds like the fuel pump

Posted on Apr 15, 2009

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My 2005 uplander wont start, sometimes it tries to but... nothing. it cranks, acts like its not getting fuel. is it the throttle body,iac,relay or fuel pump, what???


I would first suspect the fuel pump. Do you hear it buzz on for a couple seconds with turning the key to ON, not start?
It should come on for 2 seconds to prime the line with pressure to the engine. Do you hear it? Stand by the gas tank and have someone cycle the key to on if you need to.
If you hear nothing from the tank, you need to investigate the fuel pump and it's circuit.
There will be a fuse for the fuel pump, it is under the hood in the power distribution box-the fuse/relay block. The power for the pump goes from that fuse to the fuel pump relay (also in that fuse/block) and when the engine computer signals that relay on, the power goes through the relay and then directly to the pump in the tank.
Try this test, if your pump doesn't work-test the FPR-to test if the relay is getting a signal from the computer: hold your finger lightly on the relay. now have a helper cycle the key again from off to on (not start). Every time the key is cycled you should feel the click of the relay energizing. If you feel it click and you checked the fuse and it is good, and you still have no pump coming on, then it is likely you need a new pump. Bang on the bottom of the tank, a couple of raps, then see if pump turns on. A failing pump can sometimes be turned on by jolting it like this, but it only works a time or two or three.
So now what? If the pump is working and putting fuel to the engine, then check for spark at a spark plug. Usually a sudden no start means the engine has lost either gas or spark.

Mar 14, 2017 | 2005 Chevrolet Uplander

1 Answer

05 Chevy cobalt have no power to fuse block for fuel pump


You have no voltage at 15 amp fuel pump fuse in the under hood fuse/relay center ? There is a fuel pump relay also in same under hood fuse box. The fuel pump fuse gets power from the fuel pump relay. The ( PCM ) engine computer controls that relay, gives power or ground electronically to turn the relay on giving power to the fuel pump through the fuel pump fuse. You could have a bad relay or an anti-theft system problem . What engine does you vehicle have 2.0 L or 2.2 L the 2.0 L engine gets power differently to fuel pump .

Dec 28, 2014 | 2005 Chevrolet Cobalt

1 Answer

Microbus 2.3i four speed fuel pump not getting power


The click you hear is probably the fuel pump relay. See if you can locate it by sound. Possibly, the power feed for the pump may not be good at the relay. Pull the relay out and check for a power signal at one of the terminals that the relay plugs into. It should be a hot- at-all-times signal, so the key does not need to be on. The power feed will come from a maxi fuse in the power distribution box, or from a fusible link just off the battery. If the power is good, try another relay. If still no pump, check the wire from the relay to the pump for a short-a broken line. If wire is good, check the ground for the fuel pump.
Go back to your checking for power at the pump: just possibly, you missed the signal with the key on, because with key on the pump is only supposed to turn on for about 2 seconds (to pressurize the lines) and then shut off until the engine is cranked or running. Try testing for power again at the tank with the key held in start-should be a steady signal then, as long as the engine is cranking over. If still nothing, back to the relay. If you now have a signal for the pump when cranking engine, it must be the fuel pump ground.

Apr 07, 2014 | Volkswagen Microbus Cars & Trucks

2 Answers

Where is the main fuel relay located


Stand by the gas tank while someone turns the key to ON. Listen for the fuel pump to come on for a second or two as it should. It will only come on for about two seconds to pressurize the fuel system, then shut off and only come on again when the engine is cranked. If you hear it, then the pump is working. Hence, you would smell gas after cranking the car a bit. If no sound from the pump, look for the relay in the power distribution box under the hood. The box's cover should have a diagram for fuel pump location. Or your owner's manual might show it.

Jan 06, 2013 | 1996 Nissan Pathfinder

1 Answer

Car will turn over but won't start. Through the


No noise from fuel pump when you turn over the car .First thing get voltage at fuel pump relay checked, is there 12 volt to the relay.If no, then problem is again the relay.--------- To reconfirm the problem, try other test, that is remove the relay and by pass the relay terminals with a jumper wire .Then with 12 volt external battery give power to fuel pump connector and see, if the fuel pump starts, then its clear that fuel pump relay is faulty.----------- Also other problem can be fuel pump inertia switch.If the inertia switch is faulty then also fuel pump will not start.-------- The fuel pump relay on a 1995 Ford Explorer is in the power distribution
box, in the engine compartment, driver's side near the firewall.----------
The fuel pump inertia switch is in the right front passenger area
it is below the dash but above the carpet in the right hand corner.--------
Its a push button type inertia switch.
--------
Fuel Pump Activation
When ignition switch is turned to START position, PCM operates fuel pump relay to provide fuel for starting engine. PCM senses engine speed and shuts off fuel pump by opening ground circuit to fuel pump relay when engine stops or engine speed drops to less than 120 RPM. When ignition switch is in ON position, EEC power relay is energized (contacts closed). Power is provided to fuel pump relay and timer in PCM. Fuel pump receives power through fuel pump relay contacts.
Inertia Fuel Shutoff (IFS) Switch
All models use an electrical interrupt switch in fuel system. During a collision or vehicle rollover, electrical contacts within inertia switch open, shutting off fuel supply to electric fuel pump. Fuel supply is interrupted even when engine is running.
A reset button is located on switch assembly. If electrical circuit trips, vehicle will not restart until switch is reset. Fuel system should be inspected before resetting switch.
IFS switch is located under instrument panel, near right side of transmission hump.
----------- If the fuel pump relay, the inertia switch and fuel pump all checked ok, and fuel pump is working with direct 12 volt source to fuel pump.Then problem relates to computer.The computer (power control module, PCM) is faulty and has to be replaced.--------- This will help.Thanks.Helpmech.

Jul 17, 2011 | 1995 Ford Explorer

2 Answers

I have a 98 jimmy.4dr, 4wd..problem --no power to fuel pump....if you stand on drivers side looking at fuse panel (the top right pin of the relay has power, but thats the only one...if i jump power to the...


Fuel Pump Electrical Circuit
OPERATION
When the key is turned ON with out the engine running, the control module turns a fuel pump relay ON for two seconds. This builds up fuel pressure quickly. If the engine is not started within two seconds, the control module shuts the fuel pump OFF and waits until the engine starts. As soon as the engine is cranked, the control module turns the relay ON and runs the fuel pump.
When the engine is cranking or running, the control module receives the Crankshaft Position (CKP) sensor reference pulses which in turn energize the fuel injectors. As a back-up system to the fuel pump relay, the fuel pump can also be turned ON by a fuel pump oil pressure switch. When the
engine reaches about 28 kPa (4 psi), and the fuel pump relay does not complete the circuit, the fuel pump oil pressure switch will close to complete the circuit to run the fuel pump.

An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold. The fuel pump oil pressure switch will turn ON the fuel pump as soon as oil pressure reaches about 28 kPa (4 psi).



You can test to see if the relay it's self is bad by swapping it temporarily with another relay. If your truck has AC then that one should be compatible. Just compare the two to see if they're the same and if so, try using the AC's relay.

Apr 05, 2011 | GMC Jimmy Cars & Trucks

1 Answer

Shorted out one of the fuel injector wires,and now my fuel pump isn't working,checked the fuses,none are blown,any ideas,other fuses or fuse link?thanks,


The fuel injectors receive their power from the Powertrain Control Module (PCM) Power Relay which is located in the Engine Compartment Fuse Box. This circuit is protected by Fuse "I" (20 Amp), also located in the Engine Compartment Fuse Box. If you blew a fuse, this would be the one.
The fuel pump, however, is a totally different circuit. (although it is controlled by the PCM which will not work if the fuse above is blown) The fuel pump gets its power from the fuel pump relay which is protected by Fuse "O" (20 Amp) in the Engine Compartment Relay Box.

Jan 30, 2011 | 1994 Ford Bronco

6 Answers

No power to fuel pump


when u checked this u do realize the fuel pump only has 12 volts for 1 second then the computer turns it off unless the engine is started? let me know.

Dec 03, 2009 | 1997 Dodge Ram 1500 Club Cab

1 Answer

Their is no sound coming from the fuel pump does this mean its broke is there a fuse ? i don't have the booklet its turning over but not getting any gas


It could be a few things. First thing is to check the fuel pump relay.

Power Distribution Center Located under the hood, in the engine compartment. It houses the fuses and relays for most of the under hood components which are not controlled by a dash mounted switch (such as the alternator, fuel pump, ECM, etc.). The fuses and relays are replaced in the same manner as the fuse panel inside the vehicle. The power distribution box cover is hinged on one end and utilizes a retaining latch on the other. Simply release the latch and lift the cover up to gain access to the fuses and relays.

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I know this picture is small but this is your power distribution box in the engine compartment. The fuel pump relay is the second square relay from the bottom. You see the two rectangular ones and then the two square ones, the fuel pump relay is the fourth one in that row. Compare the numbers on the relay, you should be able to swap it with a new one no problem.

Oct 26, 2009 | 1996 Ford Explorer

1 Answer

Gas not getting to engine


Hi. Have you change the fuel pump relay?
If not change the relay, The original number is, RZ0088.
In the fuse box below the steering column. Is there a fuse for fuel pump.
The relay is a common problem for this cars.

Jul 04, 2008 | 1991 Honda Accord

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