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
Gnarley wrote:
Tuesday morning after checking various connections and replacing a suspect damaged fuel pressure regulator we removed the frame rail secondary pump!
Gnarley wrote:
I can't imagine what may be causing the loss of pressure when it's hot and the engine controls sense the need for more pressure and you can see it drop on the gauge.
Based on your first statement, you have a "return fuel" system and the engine mounted, vacuum operated pressure controls the fuel pressure NOT the ECM. With no vacuum to the pressure regulator you should get maximum fuel pressure.
Remove the vacuum line at the regulator, plug it and then see what the fuel pressure does.
