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Fuel Pump relays and wiring 700

posted by  someone claiming to be hiram6 on  Sun Oct 16 08:22 CST 2005 [RELATED]

Hi all, I'm going nuts trying to figure out the previous owners wiring workaround on my fuel pump wiring. I'm trying to "put it back the way it's supposed to be" but so far have just succeeeded in totally confusing myself.

Here's what the PO had in place. He had an orange wire coming from somewhere back in the dash that provided 12V+ to the number 11 fuse directly via a fuse tap, bypassing whatever Volvo had designed. Best I can tell, based on my Haynes manual and the 700FAQ here on this site, it seems that this fuse (for the in-tank pump) is supposed to receive 12V+ via a fat pink wire that comes from pin # 87/2 on the white fuel pump relay. With the relay in place, no 12v+ is coming from that pin. But the relay is clicking, and seems to be working correctly. I even swapped it out with a new relay to test it, and I'm getting the same results.

If I pull the relay, and use the jumper wire described in the FAQ, the fuel pumps (both) operate, but with the ignition OFF, as well as ON. The FAQ makes it sound like the jumper wire test should only work with the ignition in the RUN position.

Does anyone have a legible wiring diagram showing the wire colors for the fuel pump relay and associated fuse panel slots for the fuel pumps? My haynes manual has completely useless wiring diagrams that are printed so small I can't read the wire color codes.

I need to get this figured out without taking it into a repair shop, I know they will kill me with labor costs to diagnose this!!






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