from bad to worst HELP

[gregorylawyer]

I have a 1990 F-250 7.3, 5spd. Went to turn off the truck and it kept running, when the key was off all electrical turned off, so I stalled it in 5th to stop it. next I checked the power to the fuel shut off electrical Ok , I had and extra switch but where the problems began, while the engine was running I pinched the fuel return line to stall the engine. but it started missing and blowing white smoke up on restarted before changing the fss switch , I went head and change the FSS, now is shut off properly but still missing and smoking , then I replace the fuel return lines and bled the injector line the miss and smoke continued and cleaned all the injectors still no change , Where do I go from here?

 

[towcat]

did you unpinch the fuel return line? these pumps do not like backpressure of any kind in the fuel return system

 

[gregorylawyer]

yes, I replaced all the fuel return lines with no improvement.

 

[towcat]

rev it up. does the smoke and miss get worse or clears up?

 

[gregorylawyer]

Worst when reved up

 

[towcat]

Worst when reved up

your pump is done. sorry for the bad news.

 

[TronDD]

Check your main engine wiring harness plug. If the glow plug wires melt it internally, they'll power the FSS all the time. I know you replaced the FSS and say it shuts down now, but mine was intermittent depending on whether or not things made a connection inside the plug. That might still be a problem.

Can't comment on the running condition, though.

Tim.

 

[gregorylawyer]

Well I replace the injector pump and she like new, thanks for the input. The moral of this story. DONT PINCH THE FUEL LINE !!!!!!!! I hate when that happens

 

[gatorman21218]

So pinching the fuel line ruined the IP?

 

[Agnem]

That would seem to be the indication, but I've seen that happen before without ruining the pump. Must have moved some dirt around with the extra case pressure or something.

 

[NO_SPRK]

all you had to do was pull the FSS wire off.. unless you did that and it kept running

 

[gatorman21218]

You sir are a genius! The other method is a phone book over the intake to choke the air supply

 

[NO_SPRK]

or just pop the shrader valve open and let some air in. that will shut her down. better then backing up fuel into the IP