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Could be that missing Check Valve... 200 1989

uid 18083's pic
posted by  lucid on  Sat Mar 15 10:14 CST 2008
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

...It's purpose is to prevent vapor lock due to "Heat Soak", which can cause fuel to boil in the fuel rail.

It isn't meant to hold pressure overnight — the spec is to maintain at least 1/2 pressure after 20 minutes.

As a diagnostic test, you could force the pumps to run for a few seconds the next time you have a hot/warm start situation. Do this by Jumpering the Left/input side of fuse 4 from the (always hot) Left side of any fuse 6—10. The recirculating fuel may clear any vapor from the fuel rail.

The +12V at input to fuse 4 goes two ways:
1) Thru the fuse to the Tank pump
2) Directly to the Main pump
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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