My 83 F-250 6.9 left me on the side of the road yesterday. Ive been having trouble with the wire connector on the shut off switch staying on but this time It wasnt just a loose wire im afraid. I had power going to the switch but when you crank it no fuel came out of the injector line but it had lots of fuel going to the pump. Left it over night and we try and start it before we trailer it..... Dumb thing starts right up. 10 miles down the road it dies again. Is it the pump? If it is is there anything I can do to get by till I find the 600 for a new pump?

 

So if I'm understanding correctly; It wouldn't start when hot, but started fine when cold?
Is it a re-manufactured pump? How old is it? How many Miles? Did you notice any leaks around the pump?

From what I understand, there is a part that doesn't get replaced in remans because it is so expensive. The part fails by creating a gap when warm, which lets air in/fuel out. So my vote is on the pump.

However, I think you should take the time to look for leaks around the pump because, like you mentioned, they can be expensive.

Also, when it wouldn't start after you drove 10 miles, did you crack the injector lines to make sure the air was being bled out? Perhaps you are losing pressure somewhere else, and you had a large air bubble in the fuel.

 

Could you have a bad shut down switch? If you have been wiggling and playing with it, it's possible the connectors inside broke loose and there ya go. If i remember correctly they can be replaced or removed and checked

 

Injection pump solenoid - Stanadyne 6.2 6.9 7.3 5.7 6.5

 

Yes the pump is a rebuilt. Grandpa had it rebuilt on march 26 1985. The trucks got 166000 on the clock. No fuel leaks anywhere on the truck (Im a gas mileage nut). I think it is the shut off switch gone bad. This sounds like some of the other stories ive heard on here. I didn't crack the line the second time it died, but once we got back home from the 150 mile trip it fired right up again on the trailer. I did take the wires off the pump when I was on the side of the road and jump them right to the battery. Heard the click on the cold idle advance but nada on the shut off solenoid.

 

No, it allows fuel to seep around it, inside the pump. This affects starting, when pressures are low and the time for it to seep is long.
Once it's running, it's not an issue.

 

Should I go ahead and buy a rebuilt one or get the switch

 

A simple test would be to have an ohm meter handy, and the next time it fails, just ohm out the solenoid. If it is opening due to heat, then you will have a high ohm reading or an open circuit. these solenoids are usually just a couple of ohms when working properly.

 

Get the solenoid, I'd suggest. It's a lot cheaper, and the rest of the pump wouldn't give you those problems.