fuel pressure

[reespieces71]

i have a 07 ford 6.0 with fuel pressure spring upgrade, and a edge gauge pack started the truck yesterday and the fuel pressure was reading 100 psi when you drive it down the road fuel pressure starts to come down to normal at 60 psi and works like normal. leave it sit and start it up again and goes back to 100 psi run down the and get the rpms up starts to come back down. could i have a bad sensor, i took the plunger and spring out to see if it was sticking and cleaned it but still does it.

[lenzhotrod]

Without your engine running, turn the key on and see what the guage reads.

[reespieces71]

ok turned key on,once the display comes on i hear fuel pump running the pressure keeps climbing until the pump shuts off, the pressure went to 85 psi

[Fox Hunt]

Sensor might be bad. The first one I had went bad after a couple months, scared the heck outta me seeing it just climb and climb. Verified it was the sensor with a mechanical gauge told edge and they sent me a new one. Now months later my second one is doing it. Haven't checked it with a mechanical gauge yet but I'm pretty sure if my fuel pressure hit 100psi my truck wouldn't be running for this long. also, first time I had the sensor right on the fuel bowl, now with the second one I got the strictly diesel hose to get it away from the heat and vibration but it still went out...

[reespieces71]

found something interesting, turned key on fuel pressure 100 psi pump turns off so i go and remove return line not much fuel coming out for 100 psi assuming regulator spring is working right, so for the hell of it i unplug the wire to the sensor turn key on fuel pressure starts to climb. how can i have a pressure reading with sensor unpluged???

[thomaslord84]

You may have a problem with the wires. I would check all the wires for any chaffing bare spots, if you fine none call Edge. That's just what I would do.

[reespieces71]

found no wires go to go edge on monday