Question about 1990 Chevrolet Suburban

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Wiring for feul pump ,have power at pump ,relay checks good , fuel pump does not come on with key only works if i run a hot from battery

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  • Chevrolet Master
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Check for a blown fuse,also,the oil pressure switch has a cut off for the fuel pump,and if the oil sending unit is bad,or the oil pressure has dropped,the fuel pump will not come on,

Posted on May 09, 2010

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Fuel shutoff. for or 20002 dodge stratus location emergency.


I just looked at a wiring diagram of the fuel controls for this model: there is no fuel shut-off switch in the wiring. It's pretty straight forward, typical fuel pump controls: the fuel pump relay is in the under-hood power distribution center. When this relay is turned on, power is sent to the fuel pump, nothing else is in the path of the hot wire to the pump module so it (the pump) should be working.

So if pump is not on, you can diagnose the wiring right here at the fuel pump relay. First you verify the power feed for the pump is available at the relay. (One terminal at the relay will have battery voltage with key off. If you pull the relay out and use a test light, one terminal position will be hot.) Next you verify the relay is working, sending power to the fuel pump in the gas tank. You do this by having someone cycle the key to on, while you hold a finger on the relay (it's back in place) to feel it click on. You should feel it, maybe even hear it, the relay will energize every time the key is turned to on, and this is what sends power to the fuel pump.` If it all works, and the pump is not on, the pump probably needs replacing. If the pump relay is not clicking on, that's a wiring hassle, including the wire to the engine computer. The pcm is what controls the relay turning on.
Do you know if the fuel pump has ever been replaced in the car? If it is original, it has been a good long run.

Mar 05, 2016 | Dodge Cars & Trucks

2 Answers

91 Geo tracker no feul to engine. Checked fuse. Feul pump rely is good but has no power to it.


Security light on? Turn the key on for ten minutes, off for thirty seconds. then try to start

Jan 31, 2015 | Geo Cars & Trucks

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

1 Answer

I have 2000 Kia spectra. It shut off while ideling. I have changed the fuel pump and checked fuses/relays. We used a insulated wire and ran it from the battery to the fuel pump relay fuse socket in the...


You need to troubleshoot the relay and terminals. First try a different relay. Another relay in your car may be same part number relay as you pump relay, so check for that. Swap in a known good relay and try it.
If no help, look at relay. Is it 4 terminal or 5 terminal? If 4 terminal, easier to check. One terminal will be your power source, and hot at all times, so check for that-use your jumper wire (if no testlight or voltmeter), stick end in terminal and just touch metal, looking for spark indicating power. If no terminal has power, maybe only hot with key on, so turn key on and check for power. If no power, the feed from battery to fuse block is lost. If you have one power source, another terminal will be to the pump, the one you turned pump on with. Terminals 3 and 4 will be the signaling source to turn relay on through coil side of relay, and a terminal to ground, also on the coil side of relay. If you have constant power on one terminal, check for the signaling power. When the car is cranking over, the signal terminal should be hot-the signal will be coming from engine computer. So when cranking, relay socket should have two hot terminals. If you don't have two, you're right, relay is not getting correct power to the fuse block. BTW, don't use jumper wire to check for signaling source, use a testlight. Don't want to cause spark from computer wire.
What is EGI? Not familiar with that.

Jan 07, 2013 | 2000 Kia Spectra

1 Answer

Cranks but wont start


Apparently the relay is not being turned on. I believe that signal would come from the engine computer. Does your check engine light come on when you turn the key to on? If it does, the computer is powered up-if no check engine light, either the bulb has burnt out or the computer has no power-check for a bad fuse.
Put your finger on the fuel pump relay and have someone turn the key to on. Do you feel the relay tick? If you do, check if the relay has one hot wire with key off-use a voltmeter or a testlight. If you do have a hot wire at relay., check fuel pump wiring from relay to the pump. Pull off the connector at the pump and replug it back in.
If you can't find a powered wire at the relay with key off, maybe it is only hot when key is on, so turn key on and check relay again for that power wire going to the relay, one wire should have constant power there. If not, there is a wiring problem between the battery and the relay. If the relay has power to it, but you felt no pulse when turning the key to on, likely the relay is not getting a signal to turn on. A shop would need to investigate that.
Well, good luck, hope you find the problem.

Dec 13, 2012 | 2000 Ford Windstar

1 Answer

How do you check to see if fuel pump is bad on a 1988 ramcharger 5.2lter t.b.I. without having to physically taking it out of tank?


Hot wire it! Set a battery by rear of car and run jumper wires to the fuel pump connector.. Instant gratification !
You could almost do the same thing at the fuel pump relay with one short jumper wire: pull the relay out and jump the battery power feed there across to the fuel pump wire. Turn key on and pump should run. Be careful, make sure you do have a single hot line at the relay with key on, and don't put the jumper wire in the wrong slot, or there won't be anything left to play with. You'd have to know which terminal was the fuel pump wire leaving there and going to the pump.
Well, there are a couple of shadetree solutions, worked for me. I assumed from your post that you probably don't have a voltmeter, which if true, is only bad if you want to do any work on your truck yourself. 'Cuz taking the tank off is a thankless, dirty job, and a voltmeter could have saved the trouble by testing for power at the fuel pump connector when the engine was being cranked over. If the wire has power, only then would you know the pump has to be taken out. Good luck.

Jul 15, 2012 | Cars & Trucks

1 Answer

Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good


  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

Feb 13, 2011 | 1992 Ford Thunderbird

1 Answer

2000 S10 4.3L Fuel pump stopped working out of the blue. We Put a new Fuel Pump in, new harnes to fuel pump, new fuel filter, new relay, new fuses in IGN C and ECM B fuses. Still the pump will not turn on....


At the fuel pump relay you should have 1 full time hot wire. 1 hot wire when you turn on the switch. 1 ground, and the other wire goes to the pump. Test the ground to be sure it is good. If so then jump a hot to the one that goes to the pump and see if it runs.If it does then you have a bad relay or ECM. You can swap the relay with another of the same # from tour fuse box to test it.There is also a ground on top of the frame near the filler neck, check it too. Good Luck

May 06, 2009 | 2000 Chevrolet S-10

1 Answer

2000 S10 4.3L Fuel pump stopped working out of the blue. We Put a new Fuel Pump in, new harnes to fuel pump, new fuel filter, new relay, new fuses in IGN C and ECM B fuses. Still the pump will not turn on....


Did you verify that the relay terminals have the appropriate signals to them? 

ECM fuse B (20-amp) should provide power at all times to the orange wire of the fuel pump relay. The relay coil receives ground via the black wire, and relay coil gets power from the dark green/white wire. When the relay is closed, you should have battery power on the gray wire. 

The relay trigger wire should have power from the dark green/white wire in terminal 1 of the Vehicle Control Module (VCM) connector for the first couple of seconds after they key is turned to run (to prime the system) and when the truck is running. Checking for all the appropriate signals at the relay is where I would start. That is after I checked for diagnostic codes.

Believe the fuel relay is the middle relay out of the three in the left rear of the glove box. Last thing is to hot wire the fuel pump if you can not get it scanned, see if the pump is bad unless your going to have a shop work on changing the fuel pump.
Good luck and hope this helps. keep me posted.

May 06, 2009 | 1999 GMC Safari

1 Answer

93 merc topaz feul pump wiring harness question


The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.

Mar 30, 2009 | 1993 Mercury Topaz

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