Emergency HELP Please F53 Fuel problems
WE are stranded in Grants Pass. We broke down near the bottom of Sexton Pass on I5 on the Saturday of the Laborday Weekend. No Tow Trucks were available and we had to stay in the rig overnight 4 fe...
Forum Discussion
carringb wrote:
That's what made me suspect a vacuum issue. The FPR is controlled solely by engine vacuum. When vacuum goes down, fuel pressure should go up. But if it's missing vacuum, the PCM will compensate via the O2 sensor, but it doesn't respond fast enough to to "un-compensate". Whenever I've run into this, I use a hand vacuum pump with a gauge, and verify fuel pressure is responding correctly to change in vacuum. Autozone should have both on hand to loan out for free. A collapsing vacuum line can also make cause similar problems.
Ahhh ! You may have a soft spot that causes a hose to collapse trapping the engine vacuum (actually lack of vacuum) to the pressure regulator.
I had a problem like this with my EGR in my 1998 E-Series. The soft hose was far from the EVR, close to the vacuum reservoir and close to the exhaust. The hose was MUSH !
