Isn't the fuel pressure supposed to stay 50~52 PSI while running, regardless of the load applied?
To me, dropping to 42 PSI means a faulty/softfail fuel pump/transfer pump.
Good Luck!
Quote:
Originally Posted by 1iwilly
hello to all
i have couple of question
1=how do you determine a softfail fuel pump
2=is the fuel pressure suppose to drop a tad when vacuum is applied under load
my fuel pressure is 42 with key on and 50 to 52 running when checking fuel pressure regulator if i applied vacuum it drops down to 42
the reason i'm asking because it seems i'm running out of fuel when down to 1/4 tank
|
__________________
01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles
