Question about 1986 Audi 5000 CS

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1986 Audi Fuel Pump not grounded

I have a 1986 Audi 500CS that the fuel pump is not grounded....any idea how to bypass the ground?????

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That fuel pump is rubber isolated from rear frame rail,,,you can remove pump,,,get to the ground wire, and put your own wire onto ground.

Posted on Jan 16, 2009


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1 Answer

Replaced fuel pump and relay. Still no fuel. Pump wont turn on. Can i bypass relays and wire directly to pump?

In theory, yes, but in practice not a good idea except to verify operation. Pump relays are usually controlled by the ECU and get power from the IGN switch. Double check your grounds at the pump.

Jan 03, 2016 | 1996 Nissan Quest

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For fuel pump relay which is hot and negative to jump wire to fuel pump

I had a burnt connector (twice) between the relay in the trunk and the fuel pump. Had to bypass the ground lead and take it straight to ground. Then the battery side burnt out and had to replace both connectors with male/female spade connectors.

Jul 16, 2011 | 1993 Jaguar XJ6

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My 2000 a6 wont start, the fuel pump does not run when the key is turned to the on position. I checked the fuse (#28-20A) and its good, I also performed voltage checks at the pump, and ohm ck's on the pump...


Apr 27, 2011 | 2000 Audi A6

1 Answer

We can not understand why it cant get fuel to the injectors

Have you tested out the fuel pump? check for plugged fuel filter?
plugged fuel lines to the fuel rail, injection pulse at the injectors? power to the fuel pump relay? grounds needed to make certain systems work must check those also. get a wiring diagram of the fuel supply system and back trace all the wiring and see if you have power and ground and signal.

Aug 28, 2010 | 1986 Cadillac DeVille

1 Answer

Car won't start no power at fuel pump or fuel pump fuse. Thanks Brian

Locate and replace the fuel pump relay and see if it will start then. Also, make sure that the battery terminals are clean and secure; also on the starter, and the ground (at chassi - or block, wherever the ground leads).

Please let me know if you need further assistance.


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Jun 30, 2010 | 1986 Chevrolet Corvette

1 Answer

Where is the ground or grounds on the harness that

I doubt you have a fuel issue if you replaced the pump. Try this to bypass the fuel pump. Spray some quick start or brakle cleaner into the throttle body. If the car still does not start then the problem is ignition related, NOT fuel related. If it does start then go to mitcell1diy online , search. You can get all the diagnoses info there.

Jun 28, 2010 | 1997 Chevrolet Monte Carlo

2 Answers

Installed new fuel pump on 1986 chevy s 10, have jiuce to all wires. pump will not work

if what you say is true and you have the correct voltage..12v to the pump, then the pump you install is bad or it has a faulty ground wire in the system.

May 07, 2010 | 1986 Chevrolet Chevy

1 Answer

I have a 1986 Ford F-350, 6.9 liter pickup. The injection pump doesn't push fuel to the injectors.... I have tried another pump but that still doesn't work. Any suggestions on the problem?

Yep!.. the problem is electrical wiring (that's only if you've VERIFIED the replacement pump is GOOD!). If you don't have POWER and GROUND at the fuel pump connector, doesn't matter if the pump is good or not... if the pump isn't receiving power (and there's a questionable ground), the pump will not operate correctly.

Sep 10, 2009 | 1986 Ford F 350

2 Answers

1997 SL2 Saturn Coupe

It really sounds to me you have a grounding issue with the pump and sending unit.
If the gauge is indicating a past full reading, the ground is open. An open or poor ground will also cause the weak fuel pump pressure.
Find the black wire at the fuel pump connection and measure resistance to ground, should read near 0.00 ohms.
Good luck and let me know.

Apr 08, 2009 | 1997 Saturn SL

2 Answers

Have a 1986 Audi 5000 CS Quatro that will crank but not start..

The ground? You'll have to be more specific. There are several grounds involved in starting the car. Whichever it is, it'll have to be repaired. This repair should be fairly simple -- replace the broken cable or clean the connection, then replace. There's no way to bypass the ground. Let me know which ground it is, and I'll try and look it up in the repair manual, and give you some tips on how to track it down and fix it.

Dec 11, 2008 | 1987 Audi 5000 CS

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