Truck just shut off

[basilry]

Was driving home tonight and my truck randomly died going down my driveway. Iv been noticing that my fuel pressure gage has been all over the dial within the last few days. Anywhere from 5 to 20 psi. I figured it was time to change the filters, havent done that in about 15,000. The rail pressure has been fine. After it died it took a very long time to fire. Once it was fired it had no rail pressure and the only code that was thrown was "low rail pressure". The engine sounded very pingy when it finally fired, I let it run for about a minute and then shut it down. I figure ill deal with it in the morning. The truck has 111,000 on it. Any ideas? Possible CP3 failure?

 

[basilry]

Fired it up this morning after cranking on it for about 15 seconds and still no rail pressure, fuel pressure is at 20, i saw 3 and then 400 on the RP gage and then it killed again after a very brief stumble. Have not tryed to refire it yet, came in to do some research. I smell a hint of fuel comming from the front of the truck but the only area that is wet is the CP3 pump, but that looks like it is oil.

 

[HOBrian]

RP relief valve. Not letting the rail build pressure.

 

[Tinman]

About a year ago, I filled up and then cranked it up to leave and after about 5 seconds in shut down. Didn't look at the gauges, didn't have a chance. Cranked right up after wards and hasn't done it since.

 

[hwebster]

My '93 died in an intersection. Had intermittent issues for a few months prior to total melt down, stalling, loosing power... Fuel Pump had departed!

 

[basilry]

Water got inbetween the connections on the rail pressure sensor and the quad rp gage wiring loom and shorted the connection out. Had to replace the rail pressure sensor and all is well. Thanks for the suggestions.

 

[jdooner]

Rail pressure

Thank you for following up!

 

[JBallou]

Did the connection between the gauge wiring and connector have a 0-ring? Pressure washed your engine recently? Quad may have mentioned on another forum that this has been a know problem and several members having heated discussion with him about failing RP sensors and the Quad being on the truck.

 

[basilry]

No the connector did not have an O-ring, and yes about 4 days earlier I power washed the engine. So I replaced the rp sensor and siliconed the connection very well. Next time I will be a little more careful when power washing the engine compartment it was an expensive engine cleaning.