1985 Cadillac El Dorado Won't start/Fuel pressure problem.

Tiny
JOE DD
  • MEMBER
  • 1985 CADILLAC EL DORADO
Engine Performance problem
1985 Cadillac El Dorado V8 Front Wheel Drive Automatic

I have a 1985 Cadillac Eldorado that wont start unless I spray starting fluid into the Throttle body.
I rented a fuel pressure gauge and it showed no pressure at all on the fitting at the line at the TBI.
When I turn on the key, fuel pump does run for a couple secs. Disconnected the fuel filter and checked pressure there as well, none.I cranked it with the line removed at the filter and fuel does pump out but not like I think it should, not very forceful.
Would this be a weak pump or a faulty pressure regulator.I have heard that these are known for ruptured diaphrams in the regulators. Help, I dont want to drop the tank and put in a pump only to find out im wrong. Dont have the money to waste. Any advise would be welcome.
TIA
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Wednesday, October 27th, 2010 AT 3:36 PM

8 Replies

Tiny
RASMATAZ
  • MEMBER
To rule out the fuel pump you must check the fuel pressure if its within specs
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Thursday, October 28th, 2010 AT 5:06 AM
Tiny
JOE DD
  • MEMBER
I DID check fuel pressure both at the fitting at the throttle body and before the filter, both show no pressure at all. NONE.
But with the car jacked up and the fuel line off before the filter or even after the filter, fuel does pump out, albeit not real forceful. Not sure if its just because the car is jacked up or what. Pump does run, but fuel isnt really coming out forceful at all. If I disconnect line at TBI and crank it, no fuel reaches there at all.I'msuming its a weak pump but not sure if it can be the pressure regulator.
Any additional advise would be appreciated.
TIA
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Friday, October 29th, 2010 AT 1:34 PM
Tiny
RASMATAZ
  • MEMBER
Sounds like the fuel pump is gone
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Friday, October 29th, 2010 AT 1:36 PM
Tiny
JOE DD
  • MEMBER
Thats what I thought, just needed it confirmed.
Any chance a regulator with a blown diaphragm causing this?A buddy suggested this, thats why I havent dropped the tank yet.
Thanks again for your assistance.
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Friday, October 29th, 2010 AT 1:40 PM
Tiny
RASMATAZ
  • MEMBER
You checked it before the fuel filter the regulator is out of the picture and there's no pressure points to the fuel pump
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Friday, October 29th, 2010 AT 1:42 PM
Tiny
JOE DD
  • MEMBER
OK, That Makes sense.
I going to install the fuel pump this weekend.
Thanks for your help.
I'll let you know the outcome.
Thanks again
Joe
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Friday, October 29th, 2010 AT 1:49 PM
Tiny
JOE DD
  • MEMBER
Hi
Just a follow up.
Dropped the tank and found the rubber hose connection from the pump to the sender was ruptured
Replaced the pump and the hose
Thanks again for your help

Joe
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Friday, November 5th, 2010 AT 2:18 PM
Tiny
RASMATAZ
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You're welcome and TY for using 2carpros-Good Luck
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Friday, November 5th, 2010 AT 3:38 PM

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