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1996 Deville
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1 Posts
Discussion Starter #1
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?
 

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98 DeVille, 97 DeVille d'Elegance
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7,345 Posts
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.
 

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White Diamond '03 DHS (with DTS floor shift)
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86,793 Posts
Re: 1996 Cadillac Deville no fuel at the rail

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

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,518 Posts
.......... 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.
 

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White Diamond '03 DHS (with DTS floor shift)
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86,793 Posts
Even if the FPR has failed I believe there should be some pressure (fuel) at the rail.
 
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