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fuel pump relay

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

fuel pump relay

Postby golfman » 26 Nov 2009, 18:41

suspect fuel pump relay faulty,1999 v70,,,any testing suggestions?
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Re: fuel pump relay

Postby BEJinFbk » 26 Nov 2009, 19:27

golfman wrote:suspect fuel pump relay faulty,1999 v70,,,any testing suggestions?

Check for power at the fuel pump.
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Re: fuel pump relay

Postby FCPGroton » 27 Nov 2009, 16:09

Bypass the relay and see if the car runs.
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Re: fuel pump relay

Postby Ozark Lee » 27 Nov 2009, 17:35

Using a paper clip to jump between the socket positions associated with pins 15 and 87 on the relay is the procedure to by pass the relay itself. If the car runs OK the relay was bad, if you still have no fuel pressure then the fuel pump itself is likely bad.

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Re: fuel pump relay

Postby golfman » 28 Nov 2009, 01:30

Ozark Lee wrote:Using a paper clip to jump between the socket positions associated with pins 15 and 87 on the relay is the procedure to by pass the relay itself. If the car runs OK the relay was bad, if you still have no fuel pressure then the fuel pump itself is likely bad.

...Lee
4 terminals----15,87,31b,31 which do i jumper across?.... 87 seems to be 12volt hot
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Re: fuel pump relay

Postby golfman » 28 Nov 2009, 01:33

BEJinFbk wrote:
golfman wrote:suspect fuel pump relay faulty,1999 v70,,,any testing suggestions?

Check for power at the fuel pump.


easiest way to accomplish?
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Re: fuel pump relay

Postby Ozark Lee » 28 Nov 2009, 03:17

Put the jumper wire, a paper clip or whatever, between the socket positions associated with pins 15 and 87.

...Lee
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Re: fuel pump relay

Postby golfman » 29 Nov 2009, 04:17

Ozark Lee wrote:Put the jumper wire, a paper clip or whatever, between the socket positions associated with pins 15 and 87.

...Lee


point taken lee,,tired yesterday did'nt read aswer thoroughly,,,,did that, still no pressure at fuel rail,,,also reading 0.5 ohms across those terminals,, with ign on,,,read somewhere should be 1.5,,any more recommendations?,i'm not so tired today, son needs to get back to school in this machine
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Re: fuel pump relay

Postby holler1 » 29 Nov 2009, 04:44

If you have a voltmeter as it appears you do, check to see if there is 12 volts at pin 87 when the key is on. If so, listen to see if the fuel pump runs when the key is turned on (before turning it to start). If the relay has voltage but the pump doesn't run, as suggested above, check to see if there is voltage at the electrical connector to the fuel pump itself. I'm not that familiar with the connectors, but I think they are accessed through a plate in the back floor of the V70. I have an AWD myself which has the pump in a different location.
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