Quote:
Originally Posted by S14DB
Get a bucket, cup, ect. Point the line coming out of the fuel filter at / into it. Have someone turn the key to the ON position without starting. Fuel should spray into the cup for 10 secs. If it doesn't put the lines back and pull the return line off the FPR and do the same test. If you get fuel coming out the return line you have them switched.
Your lines should run: Supply, Fuel Filter, Rail, FPR, Return.
If you get constant fuel out of the filter for 10 secs while the car is turned to the ON position and you lines are correct like above. I would say your FPR is bad if you aren't building 43PSI during key on prime. Or the pump can't build pressure.
To test if it is the fpr or pump. Hook up everything then pull the return line out of the FPR. put the cup in front of the line out of the FPR. Have someone do the key on prime again. You should hear the pump run then a few seconds later the fpr will start returning fuel as it gets up to 43.5. Then is should stop right at 10secs when the pump turns on and hold 43.5 in the supply line. You may get a drip as the FPR weeps out the pressure but not a full flow until there is no pressure on the supply.
If fuel just pours out the fpr when you prime the car till the prime stops the FPR is bad. If no fuel comes out of the FPR at all the pump is bad or a line is leaking.
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Thanks for the detailed tips.
The lines are correct; when I turn the key to ON position fuel comes out of the supply hose (fuel filter hose). I can't seem to get the gauge to move yet the car is supplying fuel? I'm going to rule that the gauge is bad. I'll return it and rent another gauge I guess.