1997 Cadillac Deville no fuel delivery

RRRRICK88

MEMBER
1997 CADILLAC DEVILLE
V8
FWD
AUTOMATIC
83,000 MILES

Had a service fuel system warning light.2 weeks later no start. New fuel pump relay, pressure hold diaphram on fuel rail. Cleaned all connections, looked for shorts. No luck. Sat over winter in garage . Charged dead battery, starts right up runs great after warm up stuck lifter noise went away. No codes, no lights . Perfect idle / to 3200 rpm smooth and quiet. Shut key off 5 mins later fading fuel pressure no start service fuel system warning light ? Faulty fuel pump intermitent?

1 Reply

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

Hello and thanks for donating

We apologize for the slower than normal response.

From what you have stated, we believe you may have a failing fuel pressure regulator. Low fuel pressure during initial fuel system priming may be due to fuel pressure regulator leaking internally. Check the fuel pressure regulator vacuum line for presence of fuel. If OK, check fuel pressure. Record Key On Engine Off pressure. Residual fuel pressure should not drop more than 5 PSI in 10 minutes. If it does, repeat test. Restrict return line after pump shuts off. If fuel pressure does not drop after restricting, suspect fuel pressure regulator leaking internally.