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How many miles, and what year is your truck? History? DougM

Hmm, if you're getting that much flow Rob, take heart it's looking more and more like an injector. If you want to get back on the road quickly, it's highly likely someone in your area can clean and flow them in a one day turnaround. Call a few mechanics and ask who they use, then call the shop...

Bummer. Yeah, the center fire will take the edge off things for sure. Hmm. That's going to be a VERY simple and effective test if you can find someone with ears to hear the pump. If the pump's cycling, then you've just got a stuck injector. Someone with OBD knowledge may be able to say...

No fuel flow with key on still fits my theory, as I realized afterwards it would only start to flow after the cylinder filled up, then the engine would have to have stopped coincidentally with the exhaust valves open for fuel to begin overflowing the cylinder into the exhaust manifold. That's...

Beno, Just a thought, but a blown piston would more likely put the fuel into the crankcase than successfully get it out the exhaust valve - depending on the size of the piston hole, of course. There will be more backpressure trying to shove it through the exhaust valve versus down through the...

Obviously, this is quite dangerous so proceed with caution. I'd think you'd get the same fuel flowing just by turning the key on, no? I would pull the cat shields so you can see the leak origin, pull the spark plugs (one loosen up and now raw gas is coming up out of the spark plug hole) to...