Question about 1998 Cadillac DeVille

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Won't start,has spark, has fuel

Recently replaced the fuel rail, fuel pump and fuel filter. Has injector pulse, has spark. Has fuel in the rail, but fuel pressure guage is reading zero

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  • Bryan Webster Dec 12, 2012

    Also, all injectors are working. Lifted fuel rail from the intake and can see all injectors firing while cranking. All fuses and relays have been tested and working.

  • Bryan Webster Dec 12, 2012

    Just an update. It was the fuel pressure regulator. When we changed the fuel rail, the new one was an updated design. The new design also requires an update on the regulator we did not know about. It was allowing all the fuel pressure to by pass and return straight back to the fuel tank.



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  • Cadillac Master
  • 21,873 Answers

Are you sure the injectors are spraying if the pressure is zero ?
Have you checked the fuel pressure regulator ?
Are the spark plugs dry ?

Posted on Dec 12, 2012

  • Bryan Webster Dec 12, 2012

    Yes, the injectors are spraying. Hal the plugs are getting fuel fouled and half are getting fuel starved. Trying to find a regulator at the parts store, but just hoping or some different things to check that we haven't already thought about. The regulator is the obvious thing, but this whole car is a basket case nightmare!



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Posted on Jan 02, 2017

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SOURCE: Hello my 1991 cadillac deville won't go over

As per the problem, which you mentioned it indicates problem with fuel pump, the fuel pump is not holding the pressure.To pump gas from fuel tank to the engine there should be pressure.But if fuel pump is worn out, then this pressure will be low or in some cases there is no pressure at all.Replacing the fuel pump should help.----------- ----------------- But there few more possibilities for this problem too, other that fuel pump and fuel filter, it can be problem with sensors, the o2 sensor.Clogged catalytic converter, problem in transmission assembly.Transmission fluid very dirty or very low transmission fluid.Also get this checked and see.To check if catalytic converter is the issue, you can try this.Remove the o2 sensor , unplug the o2 sensor then rev the engine and see.If it goes up to 2000 to 3000 RPM then its catalytic converter issue. But if same problem like before is there, then get the fuel pump replaced, get the fuel pressure checked.It can be checked at any local garage.If the fuel pressure is checked fine then in that case get other possibilities related to transmission checked.----------------- This should help.Thanks.Helpmech.

Posted on Jun 17, 2011

  • 4 Answers

SOURCE: 1990 deville, replaced ecm, fuel pump, filters,

I had same problem in my 90 deville. Drove myself crazy, I replaced the sending unit in the tank with a new fuel pump. I also had to replace the fuel pressure regulator, which sits behind the rail system. It worked for me.

Posted on Jul 13, 2009

  • 55 Answers

SOURCE: Got fire, fuel pump and pressure good, but no

check fuses and relays, might have to check wire harness for injectors, you may have a break in the wire and have to reconnect it. check for voltage at injectors one at a time see if its all or one

Posted on Apr 25, 2009

  • 811 Answers

SOURCE: on and off fuel pressure @ the fuel rail of a 1990

check pressure relief valve

Posted on Sep 12, 2009

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SOURCE: 1999 devile. No spark, no injector pulse. What's

crank sensor is bad

Posted on Dec 06, 2009

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Test: car won't start

does it crank but not start or does it just click like dead battery or starter if it cranks check for spark and fuel pull spark plug wire and insert a screw driver and hold it close to an engine ground and have someone try to crank the engine is there a strong spark and use what is called a noid light it plugs into the plug for the injectors to see if the injectors are pulsing it should blink when you try too too start the engine if you have pulse and spark check for fuel pressure there should be a service port on the fuel rail that looks like a valve stem for a tire sort of youll need a fuel pressure tester if you had no spark or pulse at tthe injectors its most likely either the cam sensor crank sensor or the computor(pcm) if only no spark change the coil if that doesnt work you might need an ignition module but that requires more testing I cant explain here see a technician if no fuel pressure remove fuel filter drain and attemp to blow air through it if you cant its clogged replace and try vehicle if no start still feul pump is bad replace pump .

hope this helped

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