Search results

I'm familiar with other 7.3 like yours. He won't get 10 months out of the head if it is already this bad. And either is very hard on these real high compression engines. Sounds like it was failing on the previous owner, and who knows how long he ran it that way already.

Unless letting the pump run a min lets it fire right up without having to touch the throttle,, I'd bet money it is a failing HH. I've changed over a dozen over the years, you are having all the common symptoms, after eliminating all the other possible causes. You should be able to not touch...

Could be the HH going bad, had one do the same would run once you got it going but wouldn't build enough pressure while simply cranking it. Have you tried running the intank pump for a minute before cranking? If it solves the problem, could be an air leak somewhere letting it loose prime...