buddy
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Ive actually watched mine go to quite a bit of vacuum on an LP that showed 5-6psi at the drain at idle.
An intermittent pressure problem sounds like a restriction or clog.
Fuel pressure seems even better after driving for a few days. I have 8 lbs almost all the time, drops to three at WOT. I think I could get it down to zero if I held it to the floor, but I havent had enough road to try it yet. Maybe I should have waited on the Walbro..
This at the drain or T'd before the IP?
just for S&Gs I put another $20 filter in it, even though the other one is not that old and still looked pretty clean. Wow. All the difference in the world. 5-7 lbs at idle, 3-5 driving around. Still drops to zero under WOT, but unbelievable difference. Whatever was plugging that filter must have been transparent, because it wasn't dirty looking to me. I've pulled out some black ones before. I used to do them every 10k but now I'm doing it more. Which stinks because they've more than doubled in price since I got the truck.
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No, it just allows better fuel flow to the filter manager.