few issues. fuel pressre and starter wiring

[83restomod]

few things going on with the motor now.

1)wont hold fuel pressure via a gauge on the FPR. walbro 255 i can hear it come on only durring cranking not with key "on". i get pressure while cranking but will drop off to 0 after cranking. lines are SS from FPR to rail, rail to FPR and SS down to the return. stock hardlines from there back to tank and from pump to firewall its stock hardline then SS to the FPR.

2) car turn "on" but when i go to crank it wont (like the NSS is not right) but the NSS is wired correctly cause i didnt change it from the previous set up. i can jump the starter with a 12v wire and get the car to crank.

CPS timing is off so i need to pull that again.


1 week till the NE meet........................

 

[CyFi6]

For the fuel pressure: Clamp off the return line and retest, if it holds you know something in your FPR is wrong

If it still leaks down run the pump to get pressure, then clamp off the feed line and shut off the pump, if it holds, you know something downstream is the problem (fuel pump check valve)

If it still leaks down clamp off the return line again and repeat the second test of clamping off the feed line just to make sure you arent leaking off into more than one place.

If it still leaks down you can narrow it down to something in the rail itself ie leaking injectors.

 

[83restomod]

For the fuel pressure: Clamp off the return line and retest, if it holds you know something in your FPR is wrong

If it still leaks down run the pump to get pressure, then clamp off the feed line and shut off the pump, if it holds, you know something downstream is the problem (fuel pump check valve)

If it still leaks down clamp off the return line again and repeat the second test of clamping off the feed line just to make sure you arent leaking off into more than one place.

If it still leaks down you can narrow it down to something in the rail itself ie leaking injectors.

thank u very much.

 

[grimreaper]

fp only comes on during cranking, not with key in the "on" position.

 

[jdub]

You can test without cranking by jumping B+ and Fp on the diagnostic block and turning on the ignition key.

 

[83restomod]

fp only comes on during cranking, not with key in the "on" position.

shouldt you hear it come on when key turns to on posistion? even for a sec?

 

[jdub]

No....the FP is only on during crank and after start. Jump the diagnostic block with the key on like I said if you want to test FP.