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Cut the oil filter apart and see what is in the pleats.

Just saw this. The pipe plugs are on the bottom of the FP main housing. They are there to add accessories, like a high idle governor, that require fuel. There is just gear pump fed fuel behind those plugs, no need to drain from them. Have you had the pump looked at yet?

It's been a hot minute, but as far as I remember, there is no drain, plug, device, what so ever on the air compressor of any compressor, on a Cummins anywho. Yes, you will disturb the injector adjustment when you remove the screw. IMHO, I would leave that to someone experienced. From my end...

No actuators, purely mechanical. No purging of the fuel system, it is a positive displacement system and will fire after a bit of cranking. No compressor case to drain, it is all gravity feed back to the front cover and down into the sump. No need to remove the rockers, simply remove the...

You won't be able to see anything. The hold downs cover them up pretty good, Only way to check them is to pull them, then you are just gonna replace them anyway and look for cracks between the injector bore and the hold down bolts. Just do the pump first, give it an oil change and see what...

No, nothing to hold, time, etc. The F/P is direct driven from the cam gear through the compressor. No sealant on the gasket when assembling. The oil there is direct return to the sump. Silicone can make it's way back into the pan and get sucked up onto the pick up. Just use a dab of grease to...

No hammers or vice grips. 3/8 wrench, 1/2 inch line wrench, 1/2 inch open end, 1 inch wrench, maybe a 7/8 for back up on the inlet fitting, 5/8 wrench, 5/8 half moon wrench, pliers for the tach drive....might be a 1 inch depending on the cable....7/16 open/box, 9/16 wrench and MAYBE a 7/16 half...

To ad a picture to your profile, when you are logged in, click on your name at the top rh of the page. A drop down box opens, click on "account details" From there you can add a picture or your avitar. Family friendly please! We have had people upload some interesting images!

PNW is a large area. Might help if you edit your location to narrow things down a bit. Maybe someone is close and cam lend a hand. If you need help. PM me and we can work out that bug.

They are the same. NHC250. The pumps can look a bit different, depending on the pump body used, but the calibrations are the same, even up into the 900 series with the NHC. They are bolt on.

I do not remember if when I put the original parts manuals up, the ones w/o the F/P and Inj data, I was part of the moderator staff, but, the reason for that being put up like that was so that IF someone just decided to just build a pump or delve into it by using the parts manual, as jimmr is...

Nope, page 29 is the gear pump. 26 would be the part of the pump that will let fuel into the CC. See the 2 seals marked #17? Those are the ones that will allow fuel into the oil. See the line that goes through all of those parts? All of that needs to come out to put those two seals in. See the...

I think this is it, https://www.steelsoldiers.com/threads/m939-nhc-250-cummins-parts-catalog-bulletin-3379699-00.125889/ The reason I did not include the pump and injector info is that one cannot just order the parts called out, assemble a pump and injector. It takes calibration stands and...

Dye made for oil/fuel, https://tracerproducts.com/all-products/fluorescent-leak-detection-dyes-oils/ Keep in mind, you should have the light from the mfgr of the tracer because all are not the same. Example, the UV tracer that Cummins uses will not illuminate with the lights that Snap-On, Mac...

One of two ways. Front seals in the pump or injector o-rings. Since the top portion on the injector is return, there is no real pressure there to speak of, but, if the o-rings are all hard, fuel will push up past all of them into the cylinder head and down into the CC. Or a cracked head, from...