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Fuel pumps work, but won't supply gas to injectors, no pressure 700 1990

posted by  guilbertmd on  Mon Sep 16 13:34 CST 2002
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Hello All

My 740ti (B30FT) won't start. Spark, but no fuel.

Main pump works, when ignition turned on. Here buzzing.
Replaced fuel filter.
Replaced main pump and in-tank pump fuses, they were good tho'.
Couldn't tell if in-tank pump worked or not, so pulled out and hot wired. Works fine.

No fuel pressure.
Pressure reg. is not leaking into vacuum line, appears fine.

This came on suddenly, no sluggishness or hesitation ever. Didn't notice noisy main pump before break down.
This occurred after inadvertantly allowing fuel level to drop way below empty before getting a fill up. Next morning on my commute, she died.

I'm trying to ID main and pre-pump in-tank fuel pump relays. I plan on replacing both or at least the in-tank relay to see if thats the problem.

Can anyone help me locate these relays on 1990 740ti Wagon? If replacement of these relays does not solve problem, I will be forced to have brick towed to shop/dealer for diagnoses. Hey, I think I can fix it, if I knew what was wrong.

Thank you


--
Mike in California '90 740 Turbo Wagon - Hydrogeology Field Vehicle






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