: Fuel pressure or pump problem? Need Help!

04-12-08, 11:53 AM
(Mornings) If I leave key on (without starting) for few seconds then turn off and repeat few times then attempt to start... car starts fine. Without following the above car has trouble starting. However, while driving the car spudders like it is starving for fuel pressure?
Codes: P0151 (o2 Sensor) Bank 2 sensor 1 which I recently replaced.
B0533 "History" Fuel sensor open/shorted to B+
Any Ideas? my fisrt thought is fuel sending unit/pump?:banghead:

04-12-08, 01:11 PM
It would be worth checking the vacuum signal hose at the fuel pressure regulator for the presence of fuel; there should be none.

It could easily be a failing pump. Invest in a fuel pressure gauge and see what the pressure is at the fuel rail under driving conditions. You will need a gauge with a hose long enough to allow you to tape the gauge to the outside of the front glass.

What year-model of car?

04-12-08, 02:25 PM
1997 Cadillac Deville

04-12-08, 05:28 PM
vacuum line checked out ok, i bought a pressure gauge but it's not the right one and I have to get another :mad