Question about 1999 Holden VT

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No power to fuel pump

Have checked withtest light no power checked fuses and relays no go

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Need wiring diagrams to work on vehicle electrical

How would you know what to test & where without
them?

Posted on Jan 09, 2013

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2000 olds siluette fuel pump not functioning,replaced fuel pump,tested relays,still dont hear it pumping. suggestions????


Do you have a multi-meter or test light?
There is a fuel pump fuse, in the fuse/relay distribution box, did you check that? That fuse and the fuel pump relay would have a "hot at all times" designation. Use the test light to see if the fuse has power at it. Next move to the FPR, pull it out and check for power. One of the relay terminals (it is #30 designation on the relay) would also be hot at all times (this terminal is coming directly from the fuse). Use the test light to check for that.
Look at the relay: on the side is a descriptor, or a diagram showing the relay terminals usage: #30 is the power feed, #87 is the feed on to the gas tank to the fuel pump. The other two terminals are the "coil side" of relay, #85 and #86, the coil side is what turns the relay on (from a signal from the pcm) and lets power pass to the pump.
If you have power at the relay terminal, you can take a short jumper wire and jump terminal 30 with 87. this will check the wiring circuit- it will send power on to the pump, and it should start working. If pump does not work, check for power on the gray wire at the gas tank connector. If no power, (and you still have the relay jumpered) then you have a bad wire from relay to the gas tank. If there is power on the gray pump wire, but still no pump when it is connected, then possibly the ground on your car for the pump is bad, or you maybe got a defective pump. Not likely, but it has happened before.
Now if you can jumper the relay and turn the pump on, we are down to the problem: apparently the coil side of your relay is not working-not turning the relay on, because of a missing signal from the pcm, or because the ground for the coil side is bad, or maybe just a bad relay.

May 07, 2017 | Cars & Trucks

2 Answers

1992 Fleetwood P30 motorhome I change the fuel pump it was working and then all of a sudden all my power to my dash lights went out I jumped solenoid and got power back to my dashboard now my fuel


You need an electrician. He will probably need a wiring diagram to figure out what circuit has the malfunction. Have you checked to make sure the fuel pump fuse has not blown?
By jumping the solenoid, do you mean you bypassed it? I don't even know what solenoid you are referring to.
The pump circuit, if like other GM vehicles of those years, probably has a fuel pump relay (under the hood) and a fuel pump fuse- probably a 15 amp blue fuse, could be under the hood or under the dash. If you check all fuses, then find the pump relay, now you can check there for power available to the relay. The pcm is what signals this relay on. Does your pcm have power? Does your check engine light come on when you turn the key to ON?

Dec 24, 2016 | Cars & Trucks

1 Answer

I have a 03 Hyundai accent I just replaced the fuel pump I have no power to the fuel pump I've checked the fuses and the fuel pump relay it won't start I'm not sure what to do next


Do you have a test light? If not, go buy a cheap $5 test light-one with a lead to clip to a ground, and with a needle type probe.
Pull the fuel pump relay out of the terminals it is plugged into-you need to check if the power feed for the pump is still available at the relay. Clip the test light lead to a ground and touch the test probe to the positive battery post-to check that your ground is good- tester should light up. Now touch the probe to all of the terminals that the relay plugs into. One terminal should have power with key off. If no terminals have power, you have lost the power feed for the pump. Double check all your maxi fuses in the power distribution box. Either a maxi fuse or a fusible link will be the power feed for the fuel pump relay.
If the power feed is there at the relay, try a new relay. If still no pump, a shop will probably have to check your fuel pump circuit.
Did you check for power at the fuel tank while the key was held in crank? When the engine is cranking, the fuel pump wire should have power. When the key is turned to on, the fuel pump should have power for about 2 seconds, to pressurize the fuel system. Then when key is turned to crank or start, the fuel pump should stay on.

Sep 07, 2013 | Cars & Trucks

2 Answers

Electrical prblem


There would be a fuel pump fuse, either under dash or under hood. Check that fuse, use the test light to see if fuse has power. If not, then it might be a fusible link or maxi-fuse that feeds the fuse panel. If fuse has power with key on, pull the relay, and use the test light and probe relay terminals, key off. One terminal should be hot at all times. If not, check for power loss between battery and relay terminal-possibly a maxi-fuse or fuse link.
If relay does have power to terminal, quickly check other terminals while someone turns key to on-for about 2 seconds, another terminal should show power-this would be signal from computer to turn the relay on to prime the lines and fuel rail. If you have that, plug relay in and cycle key. Does relay click? If yes, relay is working and problem may be at fuel pump connector. If relay is not working, but you have power to it, and the short signal from computer is there, then check the relay's coil side ground. Computer signals the coil side and the signal goes to ground from relay coil side.
Pull the relay and use a jumper wire from relay's hot terminal to fuel pump terminal-the wire to pump from the relay. If pump comes on, the problem is right there at the relay-either no signal from computer or the relay coil's ground is lost. If pump does not come on, again check connector at pump-that or the wire to pump[ has a problem.

May 12, 2013 | 2001 GMC Savana

2 Answers

88 chevy 350 with no fuel pump and no injector pulse


The fuel pump circuit and injector circuits are fed by two different fuses.
The fuel pump relay and injectors are controlled by the computer. Have you checked both ECM fuses for power ?

Apr 10, 2013 | 1988 Chevrolet K1500

1 Answer

Im trying to find a wiring schematic for my 1990 nissan mainly fuel pump relay to the fuel pump to the fuse under the dash


The fuel pump relay is powered by a 10amp fuse.
The computer relay is powered by a fuseable link connected to the battery.
You might want to check the lines coming from the battery and starter for open circuits.

Wiring diagram courtesy of autozone.com

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Mar 01, 2013 | Nissan Cars & Trucks

1 Answer

How do I check fuel pump fuse on 1989 gmcs15


The fuel pump relay gets power from the ECM fuse which also powers the computer. So if the check engine light does not come on when you turn the key on, it could be the fuse. But it could also be the pump relay.

Aug 17, 2012 | GMC Cars & Trucks

2 Answers

1992 Buick Roadmaster no power to fuel pump. New fuel pump and changed the ecm ...please help


Theres a few more checks But i'm sure you checked the fuel pump fuse already ..Use a test light and check to see if the fuel pump relay is getting power from the supply and from the Ignition feed. should be a schematic on the underside of the relay..if no power from the feeds check for a blown or rotted fuseable link or a maxi fuse..good luck

Jan 27, 2010 | 1992 Buick Roadmaster

3 Answers

No power to fuel pump.


check your fuses under the dash and under the hood

Oct 14, 2008 | 1985 Ford F 250

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