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What's the purpose of the check valve? So far as I can surmise it really just allows fuel flow through the boost pump when the engine is off. Once started, higher pressure goes to the filters and effectively closes the little check valve. I though about welding a plug in the removable threaded...

Excellent! When I was having the similar issue you were, you'll remember I said I wasn't sure if the proper OEM in tank pump or the boost pump being replaced was the cure since I did both at the same time. Now after seeing your post, I'm almost sure it was that airtex I had on it. And I had it...

Your boost pump is still suspect. Mine was badly scored from junk fuel at the two plate halves that sandwich together. When I put the kit on my new used pump that is when the problem was fixed. You should also check the overflow valve on the side of the hydraulic head. If stuck open there will...

They’re getting harder to find since AMBAC doesn’t make the kit anymore. South Eastern Equipment company or “seco” has them still on eBay or you can call order too. Nice folks, good parts. I don’t recall the TM even mentioning rebuild for this part, even for the injection pump TM. But it’s...

So my problem as Floridianson mentioned was the same as yours. I also updated all my lines to DOT 1/2 nylon, had new filters installed. I put new o rings from hardware store in my boost pump while replacing the main boost pump shaft seal which was dumping fuel in the crankcase. Fuel pressure...