Is there a way to pressure test the fuel system with the engine off? I want to make sure there's no leaks before install the plenum manifold. bl2009

 

No idea what year or configuration you are working on.

If its fuel injected, most Ford FI systems have a priming function. Turn key to ON, not START, and the electric fuel pump will pressurize the system. With no crankshaft/distributor rotation, the PCM will turn off the pump after a few seconds. Just turn key to OFF, then back to ON to try it again, as many times as needed. The fuel system will pressurize to the regulator bleed-off pressure, and will hold there for a long time, if no external leaks, or leaky fuel injectors or leaky regulator or leaky fuel pump check valve.

 

I had type a lot of background info and somehow it got deleted so I just got the question in without deleting again.

The truck is a 1997 F150 4.2L V-6 engine Manual transmission XL 3 Door extended cab. I'm in the process of installing wrecking yard engine and I'm at the point where I want to pressurize the fuel manifold to check for any leaks before I install the plenum manifold. I do not have any of the engine wiring connected yet. No sensors connected. Just the engine bolted to the transmission with exhaust system hook up. Water pump and radiator is still off so I can get into the engine compartment easily (I'm Old-n-fat) and I like to be able to have access to engine and will install the components as can going back to front. I'll probably install the starter this morning. I Just didn't know if the fuel pump would energize without all the sensors being connected. Would this be considered a "Static Test"? bl2009