Question about 2001 Volkswagen Cabrio

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I have power at the fuel pump relay but not at the fuse. should there be power at the fuse all the time or does the relay power the fuse?

This is an intermittent problem I've been working on. I changed the relay but that didn't work

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  • Volkswagen Master
  • 641 Answers

Relays usually have power on two terminals. One is power for the high side which powers the component and the other is power for the low side which energizes the coil once it's grounded to latch the relay. The power comes from the fuse. Make sure you test both sides of the fuse or simply replace it. Make sure the terminals aren't pushed back into the fuse box. Identify where the power comes from ignition switch... etc... And Check for open/shorted or failed component.

Posted on Apr 01, 2014

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Posted on Jan 02, 2017

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Thunder55
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SOURCE: NO POWER TO FUEL PUMP, RELAY WORKS FUSE GOOD

If you have put direct power to the fuel pump and it still wont work, then get an electrical test unit, test light, and ohmmeter, and check to see if there is a break in any of the wires, and that you have got a good ground connection from the ground feed.
After confirming you have good connections, then it will be obvious that the fuel pump needs replacing.

Posted on Jan 29, 2009

  • 226 Answers

SOURCE: no power to fuel pump fuse 2000 beetle

Most fuel injected cars have an "impact' switch that cuts power to the uel pump in the event of an accendt. It can trigger if the car has had some sort of impact. It is usally in the rear under a panel and it should be mentioned in your owners manual.
The 50 amp fuse will be in the power ditribution panel, which should also be in the owners manual... Lee

Posted on Sep 28, 2009

  • 1 Answer

SOURCE: no spark no fuel no start! replaced and checked

funny thing is I have a 2002 GTI with the exact same problem. have spent the last three days at work trying to figure things out.. best of luckn email me if you figure anything out. Beattie411@gmail.com

Posted on Mar 19, 2010

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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.

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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.

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