Injection Pump and FSD

[audiofetish]

I would buy the harness and a new Dtech PMD. Here is a link to a place that sales both. http://www.dieselcare.net/CHEVROLETPRODUCTS.html. Also http://www.pensacoladiesel.com/index...oduct_id=30100. but they only sale the PMD and cool kit. I wouldn't sugest spending the money on a cool kit. You can add a CPU heat sink for 10 bucks at a computer store. Leave your old PMD in place so if you ever need to use it in an emergency it is still there. Like Plano said, this is a cheaper way too start. Hope this info helps!! Also check out humvee.net lots of H1 info….

[M. Grogan]

Thanks guys. I was also thinking along those lines. If it does turn out to be the optic sensor, is it replacable? I've seen a few for sale online but I'm not sure if it is a bolt-on component or if it requires adjustment.

[audiofetish]

Originally Posted by M. Grogan

Thanks guys. I was also thinking along those lines. If it does turn out to be the optic sensor, is it replacable? I've seen a few for sale online but I'm not sure if it is a bolt-on component or if it requires adjustment.

Yes it is replaceable. Here is a link to the replacement on a Chevy Truck. http://www.mamut.net/royh/newsdet9.htm

I think the sensors are very expensive. If it comes down to it and you find out yours is bad let me know. I am putting new heads on my 00 HMCS and I am replacing everything from the heads up with new parts. I have a Injector Pump that I could sell you pretty cheap. I can take it to a place downtown that will bench test it to be safe but it worked great until I tore my truck apart. It is complete and you would be able to pull the optical sensor out of it. Just let me know. Good luck!!

[HUMTECH]

I have to agree with Plano, an intermittant p0251 is very likely air entering the fuel system. You could try swapping out the inj pump feed hose with a clear plastic hose and run the engine and inspect for bubbles. also if you relocate the pmd and leave the old one in place you will need the resistor from inside the connector body, or a new one of the same value. The resistor is mated to the pump so the same value resistor is required in the new pmd. Hard to see but do able with a mirror and flashlight, not to mention a little patience.