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Ah! That's right! Dang, it's been a year so I haven't messed with mine since that first time. I completely forgot.

So, after consulting the manuals the 939's with NHC 250 trucks do use an ether cold-start system (the button you mentioned). The 939 manuals still show the fuel canister and petcock, so I was correct on that count. Open the valve and ream it out with a bit of stiff wire. Use a rubber strap...

If you've opened the petcock at the bottom of the housing and nothing drains out, you have a lot of crud at the bottom. Open the petcock, grab a piece of stiff wire and stab/swirl around up in there to try to clear it. I have an M813 truck. I have a hand pump on the dash as part of the "cold...

You don't say if you have the M809 or M939 series truck, but all the 5-ton tech manuals are located here: https://www.steelsoldiers.com/forums/5-ton-and-up-tms.115/ The whole filter housing itself simply unscrews if I remember correctly. If it's been on there forever, you might need a big...