No start Ford E350 460cid EFI

94 Ford E350 460cid EFI
Things Replaced So Far...

1. Fuel Pump w/strainer
2. Fuel Filter
3. Fuel Pressure Regulator
4. IAC (Idle Air Control) unit
5. TPS (Throttle Position Sensor)
6. EEC Unit

Sympton...
1. Will not run without having to continuously pump the pedal?? I can keep it running all day like this.
2. Will crank and has spark.
3. Checked the injector pulse with a noid light and it seemed pretty weak compared to others I have tested. (Barely lights up at all)

I really need a Ford Guru for this one! Are there anymore of them out there?? This is an RV that I'm helping my ederly neighbor get running again. They are great people and really can' t afford to have it towed 50 miles to the dealer for something maybe we can fix here. So if you're reading this and you can help or you know someone that can help, please send me a message or post it.

Thanks for your help,

Scott in Goldsboro, NC

Have the fuel injection system been COMPLETELY cleaned? If not this can cause a big problem. Also, it probably needs computer scan to see if there is a EGR sensor needing replaced. Try to find a mechanic that will do you right before you go to a dealership! KeriSue