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Otten33

Cadillac Deville crank but no start

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I think if I tried the gauge on my silverado and it reads correctly then the gauge should be fine.  I'll test it out before buying a pump.  Is there another way to test pump?

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Not that I know of.  Logan has thought it was the pump as soon as you tested its pressure.  

It is odd that it was replaced 2 months before you bought the car in an effort to fix the problem, it is too coincidental to me that the replacement would be defective but that is possible.

Ill check my manual and post again


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Is AcDelco pump worth the extra 100 compared to airtex or spectrum or delphi pumps?  Has anyone used those other pumps.  If i do have to replace pump, should I just stick with AcDelco?

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Personally, I would use AC Delco or Delphi if money were not a consideration.  

Lets see what others have to say.


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I don't see anything that proves the pump was....in fact....replaced. No one in the room saw it replaced....or maybe it was a flubbed installation or wrong pump. 

What year and engine is the Silverado? It likely has a different fuel pressure spec. I can look up the spec. That would help verify the gauge reading.

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I think (just my two cents) is that the pump is bad.  I have seen on other sites that you should really use an A/C Delco (or other OEM); maybe the pump replaced was an off brand.  (Just a WAG; wild arse guess).  I surely will yield to the more tech-savvy responses.

Edited by cdgrinci

Chuck

'17 XT5, '04 Bravada........but still lusting for that '69 Z-28

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I should add.....there was a Mercedes we inherited once.....sat unused for 5-6 years in a hot climate......sour fuel. 

Original pump and fuel filter were locked with a black goo...fuel level sending unit was also bad.....first replacement pump also failed after a couple of months. Second replacement pump kind of fixed it. 

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Logan it's a04 chevy silverado with the 5.3 liter.  Gas looked fine and have since added new fuel.  Let me know on fuel pressure specs of silverado and I'll try gauge on it.  Thanks.  I'll probably go AC Delco just to rule it out.

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having used both the OEM and the airtex pumps I recommend going with oem


GM FAN FOREVER

Nice, clean, luxury= fine automobile

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Service manual shows 55-62 on the 04 Chevy 5.3L. 

My guess is the gauge is 'good'.....but you never know. 

04silverpress.JPG

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Tested silverado fuel pressure.  Key on 52 PSI.  Truck running 60 PSI.  Was able to bleed all the gas I wanted.  I would think that shows fuel pressure gauge is working just fine.  I ordered an AC Delco fuel pump.  Should arrive tomorrow. 

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Terrific!


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok, installed new fuel pump.  Primed fuel system.  No change. No start.  BTW I could hear the pump running.  So I decided to check the pressure.  It was zero.  Tried again and no pump was running.  Check connectors.  Everything looked good.  Checked with test light.  Had power on one port in each connector.  Checked with multimeter and had some resistance.  Not sure if I was supposed to.  Any ideas?  BTW I thought the new pumps required a new connector to be spliced in?  Old pump was not so old.  Manufacture date was September of last year so maybe previous person already did it.  Only thing I can think of check the spliced.  Maybe a bad crimp connection.  O can never get those things to stay tight.  I would wire directly.

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Ok, disconnect both lines the feed and the return at both ends and blow compressed air through them. Even remove the fuel filter.   Be careful you dont blow fuel all over, drain the lines if you can or blow them into a bucket with paper towels to absorb fuel.  

See if lines are crimped air should flow.  It could be crimped.

You are at the place the prior owner was at.  You will get this 


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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If the contacts on the connector are not burned or charred or the plastic melted, I would think it is ok


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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It has occurred to me that you have a problem in the in the feed line. The reason I say this it's because you are unable to draw fuel using the gage.

If the clog was in the return line you would be able to draw fuel from the feed at the fuel rail.

Fuel pump typically will run 10 seconds until it's pressurizes the line.

I think you are getting very close

 


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thanks.  I thought the fuel pump was only supposed to run for 2-4 seconds.  So disconnect the fuel lines from pump and remove fuel filter and blow compressed air through them.  Then disconnect fuel rail lines and blow compressed air through those back to the fuel filter that is removed into a bucket?  I'm looking for a blockage in the fuel line itself?  I was thinking I should check to make sure the fuel pump relay didn't crap out on me and/or the fuse didn't blow.  Maybe I will still do that as it is an easy check.  Thanks for the help.

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It is difficult to be clear here I am sorry.

You have to determine if a line is crimpped, kinked, smashed or clogged.

I originally thought blowing compressed air from the fuel pump side of the lines toward the front of the car would be the way to go.

That is until I remembered about the fuel filter.

It is necessary to eliminate the fuel filter for this process I don't want you blowing compressed air through the fuel filter.

Something is stopping the flow of fuel it seems

 


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Gotcha.  I'll remove fuel filter and blow compressed air from pump to where the filter was.  Then I'll disconnect fuel lines at the engine and blow compressed air back to where the filter was.

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If the fuse blew, you would hear nothing.

You previously said you checked the fuses.

The fuel pump relay certainly could be a problem as I said previously.  It should run about 10 seconds.  Drain pressure at the rail and see how long it runs.

Ill find my 96 powertain supplement manual there are tests for voltage.  It is either kinked or you have a power problem


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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3 minutes ago, Otten33 said:

Gotcha.  I'll remove fuel filter and blow compressed air from pump to where the filter was.  Then I'll disconnect fuel lines at the engine and blow compressed air back to where the filter was.

That is a good plan.

Have a fire extinguisher nearby and don't do this in garage


Pre-1995 - DTC codes OBD1  >> http://z-cut.de/US/dtcobd1.html

1996 and newer - DTC codes OBD2 >> http://carprogrammer.com/Z28/PCM/OBD2/On-BoardDiagnosticTroubleCodes(OBD-II).mht

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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That means I am going to have to push it out of the garage! Shucks.  I don't hear anything anymore.  It ran for the 3 times that I primed the system, key on 3 times and listen for the pump to pressurize and then turn off each time.  When I went to start it, no change.  Then I went to check pressure and there was 0 PSI.  Tried to prime system again and pump would not turn on.  Sounds like power issue to the pump to me.  I would think that maybe I blew a fuse now or the relay crapped out on me.  When I get home I can check.  I'll switch relays and check the fuse for the pump.  Can compress air cause a spark or static electricity?

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