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5.7 gxi fuel pressure issues

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mww4040

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gotta 2002 5.7 gxi, low pressure fuel pump reads zero. high pressure test at rail reads between 85-90. Engine starts fine runs fine on the water . Sputters and wants to die at higher RPMs.
 
the engine needs to be under load and at different RPM (idle, 2000, 3000, and WOT) to check the fuel pressure...

The rail pressure seems high to me (assuming the reading was using the PSI scale)...
 
mww4040 said:
gotta 2002 5.7 gxi, low pressure fuel pump reads zero. high pressure test at rail reads between 85-90. Engine starts fine runs fine on the water . Sputters and wants to die at higher RPMs.
Click to expand...
Being a 2002 I'll assume your GXi is above the B series, so at least C to G, serial number will verify
If correct your fuel pressure should read, Low side 8 +/- 4 psi, High 50-60 psi from idle to WOT

Seeing your at 85-90 psi, your Fuel pressure Regulator took a dump, or the return line back to the filter is clogged solid
 
makomark said:
the engine needs to be under load and at different RPM (idle, 2000, 3000, and WOT) to check the fuel pressure...

The rail pressure seems high to me (assuming the reading was using the PSI scale)...
Click to expand...
makomark said:
the engine needs to be under load and at different RPM (idle, 2000, 3000, and WOT) to check the fuel pressure...

The rail pressure seems high to me (assuming the reading was using the PSI scale)...
Click to expand...
makomark said:
the engine needs to be under load and at different RPM (idle, 2000, 3000, and WOT) to check the fuel pressure...

The rail pressure seems high to me (assuming the reading was using the PSI scale)...
Click to expand...
AllDodge said:
Being a 2002 I'll assume your GXi is above the B series, so at least C to G, serial number will verify
If correct your fuel pressure should read, Low side 8 +/- 4 psi, High 50-60 psi from idle to WOT

Seeing your at 85-90 psi, your Fuel pressure Regulator took a dump, or the return line back to the filter is clogged solid
Click to expand...
 
Yes my guage is PSI , but its a cheap gauge . Not sure if that would be an issue ? Engine model is 5.7 gxi c. I removed the pressure regulator and inspected, found it to very lightly dirty, didn't see any of the paint chips everyone mentioned. Cleaned and reinstalled, not sure how to go about finding and inspecting the return fuel line ? Should I just replace the fuel regulator at the rail ?
 
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