Driving home on freeway yesterday at 65mph and it just died... Pulled over and I have 6psi into injector pump but nothing going out of injector pump. Thought maybe the gear fell off or something but when I pulled the timing gear case cover it all looks good. So... when injector pumps fail, do they just all of a sudden stop with no warning? or what? I have less than 200k on the truck.

 

Could be a few things. Fuel shut down lost power or bad, seized up head an rotor in pump, or if the nut on the gear is loose could of jumped time or sheared key way off.

 

Make sure the wire to the fss is nice and tight and that it has 12 volts going to it. Your problem could be real simple to fix, good luck...Mark

 

Thanks! Okay just checked the FSS with the key on and I have no power to the wire that goes to it. what would cause that?

 

If I find out that a fuse caused me to have a $285 tow bill and 24 hours of stress... That does it I'm going fishing!

 

I really don't know how it is powered, but I think that it my depend on what year truck. One thing you can do to prove it is the problem is to put a jumper wire from the positive terminal on the battery directly to the fss. It should start. I am sure the experts will chime in on how it is powered...Mark

 

Did you lose power to anything else like the Radio, gauges, ect? There is a fuse link that powers those. Check out the wire that powers the fss too make sure it isn't shorting out anywhere on its way along the engine. Someone here just went through this a few weeks ago.

Mark is right on with the jumper, that's your first test on a no start died suddenly issue. Worth keeping a piece of wire in the glove box

 

Okay. The FSS is just below the power screw right? If so then I definitely have power to it (was looking at something else earlier). Could it be bad? is it easy to replace? Any particular place or brand I should get?

 

I am not sure where the power screw is, but the fss is on the cab side of the pump (backside), mounted real close to the pump, so that you cannot get a socket or wrench on it. It is pretty easy to get out with a cold chisel and hammer, goes back in the same way. Can you hear it click when 12 volts are applied to it? You can test if it is the problem by removing it, remove the plunger and spring (gut it), replace it, see if it starts. You will have to use the manual lver to shut it down. The fss is readily available. Have you tried priming the system? If you search fss, bc847 has posted a real good diagram of the ve pump indicating where it is (recently)...Mark

 

Well I pulled the FSS and it's in perfect working order. Shaft on plunger was kinda grungy so thought I'd clean it up. Put 12v to it and it engages fine so I reinstalled, tried to bleed the injector lines AGAIN. Still nothing. What's left?

 

Leave the piston out and try it.

 

Piston and spring out. Still nothing.

 

Could it be out of diesel?, don't want to insult, just asking about possibilities. I would try checking the lift pump. Is there evidence of diesel in the oil? The suddenness of it is what bothers me...Mark

 

Ya, bothers me too! I have a newer FP (replaced a couple of months ago). Unhooked the steel inlet line at the top of the IP to see if maybe I could see an obstruction... Nope. Pushed on the priming lever and fuel freely shot out of the end of the line so the only thing I can think of is there was some kind of catastrophic failure with the IP.

 

Are you getting good fuel spray out the injectors when you bleed them? You say 6 psi at the pump? Has the filter or any lines before the injection pump been opened? I'd give it a sniff of ether to see if it will catch. Just ensure the grid heaters are not on.