Installed my rebuilt 250 Cummins fuel pump - Steel Soldiers::Military Vehicles Supersite

70deuce · 04-25-2009, 16:30

Took my Cummins 250 fuel pump off to let the people at Marini's Diesel in Commerce City, CO do their magic on it. They specialize in Cummins motors. My M818 was getting harder and harder to start and had an messed up idle. Also after idling for a few minutes you could floor the pedal and nothing would happen for a few seconds. Anyways they went completely throught the pump. Mainshaft was worn, most O-rings and springs were shot. They bumped up the output by about 15%. Man does that thing run now. Way crisp throttle response. Finally have some dark smoke coming out under load. Starts right away, idles way smooth. These guys had already done the injectors so now I have a better than new fuel delivery system on this truck. One thing all 250 owners might want to check is the rubber coupler that goes between the three accessory drive teeth and the pumps three teeth. Mine was completely GONE!!! See pics on what it should like. After 37 years it came apart at some point and disappeared into to the oil pan. The pump was driven through metal to metal contact with an inch and half worth of slop. The Marini guys say this is not uncommon even on newer engines. Pump comes off fairly easy an is not timed. Rebuilt pump came back with a new one and flange gasket.

papercu · 04-25-2009, 16:34

Great fix and pictures. Would the price scare us? Wayne

area52 · 04-25-2009, 16:35

If you don't mind, how much did it cost for the work?

Looking sharp and glad to hear its running better!!

area52 · 04-25-2009, 16:37

Was that return spring on the emergency shut off valve a "field mod" by you?

70deuce · 04-25-2009, 16:37

Might not. They charge $425 to do the work on this pump no matter if they have to replace everything or just do adjustments. For how this runs now it might be on the higher side but it was worth it.

70deuce · 04-25-2009, 16:39

Yes it was. I put it on there to ensure the valve stayed all the open and would return to open if I ever had to pull the t-handle.

area52 · 04-25-2009, 16:40

How long did they take to do it?

70deuce · 04-25-2009, 16:40

should have come out "all the way open" in my previous response.

70deuce · 04-25-2009, 16:41

Two days. That shop has one guy that just does injectors and pumps.

papercu · 04-25-2009, 16:48

My switch shut down has never worked but I found another one of those stops that is on the end of the wire and put it ahead of the shutdown lever. Now it works like the deuce. Wayne