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It was a gummed up sticking return line check valve, after cleaning, it literally is clear! and running good so far. A couple had recommended breaking the glass check valve, but as I said it was like it was getting too much fuel in the return. So I wasn't about to break ****.

I believe I may have a injection pump issue. Definitely related to the fuel return. 84 M1009 It has slowly progressed, After an 1/2 hour or so of driving, once you stop it would have no power & take forever to get back up to speed. Let it sit for a while and it would go back to normal. Each...

Guess upstream isn't the right term, when it dies out, the filter on the firewall is full of fuel. So my thinking is if the sock or lift pump were the issue the injection pump would have sucked the fuel from the filter. Thinking the issue is between firewall filter and the cylinders. Odd that...

Each time filter was full of fuel, so it would seem the issue is upstream of there.

Update: The filter isn't the problem. Not knowing squat about diesels, I'm guessing injector pump. Will surf through the troubleshooting section b-4 I spend $ on a pump.

update: After the show it started up for a second, stalled, cranked a little bit started idled for a few, drove it onto trailer, 30 mile ride, sat an hour or so, started up, backed off trailer, parked 150' away, sat another hour or so. Checked hoses @ lift pump, all in excellent shape, (notice...

I was heading 30 miles to a MV event today, truck running fine (84 M1009) after a leg of the trip about 12 miles at 60 mph, had to make a turn. Low acceleration power, initially though that it just didn't downshift. Couple miles to a stop sign, took off pretty doggy long time to pick up speed...