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2002 Seville SLS
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18 Posts
Discussion Starter #1
Hello,

Replaced Fuel Pump for previous problems starting car. Pressure readings with new Fuel Pump in correct range (41 - 47) when replaced.

Now 1 month later having same issues with starting after sitting for a while.

Took to shop and fuel pressure readings are as follow:

Key to ON position- pressure shows 45 for the 3 seconds the fuel pump runs, then drops to 41 and holds.

Start engine and fuel pressure reads 35.

Turn off engine and pressure drops to 32. After 15 minutes it reads 34.

Checked FPR at idle and no signs of leakage.

Could FPR be bad and not indicate so with idle test?

Any ideas where to look?

Thanks,

BS (My initials)
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,403 Posts
Change the FPR. Vehicle mileage ??? When was the fuel filter last changed ? For a 2002 the normal mileage could be as high as 175,000 - too long for any fuel filter.
 

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Registered
2002 Seville SLS
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18 Posts
Discussion Starter #3
Mileage is 116 K, New Fuel Filter when new Fuel Pump installed 1 month ago.

I'll have a new FPR installed and report back.

Thanks,

BS
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,403 Posts
Get the FPR from RockAuto and install it yourself. 5 minutes - or you can pay someone an hour's labor and retail for the FPR.

Cadillac Tech Tips - in the right rear of the fuel rail. One vacuum hose, one hairpin clip.
 

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White Diamond '03 DHS (with DTS floor shift)
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86,779 Posts
Could FPR be bad and not indicate so with idle test?
Possible if the leak is very, very small.

Try this, do the test just as you did, but this time add vacuum, either with a hand held vacuum pump or by leaving the hose on the FPR and sucking on the other end. Then check for fuel in the hose.

Fuel filter cannot be the problem. If it where clogged enough to cause hard starting, the engine would stall out at higher fuel demands, even on moderate acceleration.

Have you ruled out a vacuum leak? How's the PCV grommet on the rear cam cover?
 
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