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Fuel pump relay may be dying; you bypass relay by...
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Posted by Micah in NC [Email] (more from Micah in NC) on Wed, 24 Jul 2002 16:43:06 Share Post by Email
In Reply to: Intermittent Fuel Pump/Won't start/electrical thing, Steve L, Wed, 24 Jul 2002 16:06:04
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using a FUSED jumper wire, with spade lug connectors on each end.

Steve, here's how:
A similar problem happened on my Mom's 1990 900 16V last week, except it just won't run or even start (starter worked fine, good spark, too).

I ended up doing the Bentley 16V book's test which bypasses the fuel pump relay:

>IGNITION DOESN'T NEED TO BE ON FOR THIS TEST.

In main fusebox under hood, remove fuses 27 & 30. (27 is hazard light circuit, 30 is fuel pump circuit--of course, pump had to be one of 'em!).

(Verify these numbers on your '88's fusebox lid before doing this test!)

Jumper the passenger side terminal of fuse 27 position to the driver's side terminal of fuse 30 position (Reason for particular choice of side: driver's side is current OUT, passenger side is current IN from power source--battery or alternator).

If fuel pump runs then, your fuel pump relay may be going bad, as this test sends current straight to pump. (The LH 2.4 computer, LH system relay, and LH fuel pump relay is located in (US) passenger's side footwell wall, right side, inside car, behind carpet on my Mom's '90. As your '88 Turbo has LH 2.2, I'm not sure where computer and fuel pump relays are.)

If pump doesn't run, then check to see if fuel pump is getting 12V at connector under your trunk floor, left side circular hole. If so, then suspect the fuel pump is dying.

I hope this helps!

Micah in NC
'84 900S, 216K mi.
'90 900, 67K mi. (Mom's, sitting at home, waiting on relay in the mail!)

posted by 216.77.233...

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