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Low Fuel Pressure, need diagnostic pathway, voltage test point. 1989 Lh 2.4 Bosch 700 1989

posted by  Adirondacker on  Fri Jan 13 00:13 CST 2006
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last visit: Mon May 12 06:34 CST 2014
[RELATED]

I have low fuel pressure, I have swapped FPR with known good one, no change.

I have 100 kpa, about 1/3 needed. No fuel flow in return, engine may run 30 sec and dies, I'm thinking cold fuel injector turns off at that point??

Where can I check voltage to pumps under load. I saw a post about a yellow wire under a 240 rear seat once. It could be pumps are not getting full voltage. I also swaped main pump and replaced fuel filter already. I have small drip on main fuel filter.


I checked rear pump amps at the fuse, it is ~4 amps, near spec.

I had rear pump out/off doing sender replacement, took it out again, swapped prepump back to original one in tank that worked prior to work. No change.

Can I get pressure if I installed pump backwards (wired backwards at the sending unit). How to test this??

Any thoughts, thanks





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