[rebob]

My son was driving the other day and the car just stopped,(4.6 northstar) I can hear the pump when I turn on the key, I have spark, but no pressure at the rail, could the fuel relay cause this or does it sound like the pump is bad?

 

[rodnok01]

Sounds like pump failed to me, you may be hearing the ELC running when turn key on. Check fuse/relay then the pressure but sure sounds like pump time. Tank has to be dropped these years.

 

[Ranger]

Re: 1996 Cadillac Deville no fuel at the rail

:welcome: :yeah: No fuel at the rail can only mean one thing.

 

[Submariner409]

.......... or the FPR (Fuel Pressure Regulator) diaphragm or vacuum supply has failed.

The car has a fuel pressure test port at the end of the fuel rail - a Schrader valve covered by a black cap. Rent a fuel pressure test set from a large parts store. 41 - 47 psi, key ON. Over 40 psi running.

Cadillac Tech Tips.

 

[Ranger]

Even if the FPR has failed I believe there should be some pressure (fuel) at the rail.

 

[Submariner409]

True - that pump moves a LOT of fuel through the supply/return loop.