Guys: Still working on the 97 F250 (7.5l) fuel problem. Was able to check fuel pressure at Shraeder valve again. At first--no reading--zero. Have a new OTC gauge with right fittings. Did KOEO--ignition on, engine not running. Hear fuel pump buzz for both tanks--switching the tank dash switch--so both pumps seem to be working OK--although forward tank is on empty and rear tank at about 1/4.. Truck has always started but run rough, blowing fuel out exhaust pipes, cat dripping fuel.Truck ran "fine" 6 months ago and has been sitting. Heard clicking, crackling noise in engine compartment. Stethoscope on injectors found #1,4,5,6,7 firing intermittently WITHOUT the engine running. This can't be right, right? Went to Power Distribution Box and swapped relays for #2 Fuel Pump and injector clicking stopped with KOEO. Also see that #1 relay is for PCM. Now have about 30 psi fuel pressure. Will spike to 40 psi at start up. Engine starts up and is definitely running a lot better--but still blowing a lot of fuel vapor out exhaust. Before swapping relays, fuel pressure would drop to zero with ignition shut of. Now holds residual with no leak down. Not sure we have found the whole problem, but if the injectors fire KOEO because of faulty relay that would help explain excessive fuel dumping into system. Have new plugs and injectors ready to install also. And have new fuel filter to install. Will fill both tanks to at least half way. Wondering if the CAT and muffler could be full of liquid fuel? Also convinced owner the engine oil was at least 2 to 3 quarts overfilled--and drained back to correct level.

Feedback?

Red Womack in northern California