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Update: Chuck cleaned the inj, they were full of the tank foam residue. New tank on the way, going with the rock auto spectra 307c, and plans to have Don Cruze do hanger, pump, and all new fuel lines to the stock rail. Aeromotive only offered to send me a new sponge after all was said and...

Or text me please 850-393-6406 thanks.

What may work well, we will drive thru your area, drop them off, go to Covington and swing by your place on our way out, does that work for you? And where am I headed to drop them off?

I will take you up on that offer, I may be driving down to Covington on Saturday, I can drop them off if you like?

The tank and pump are correct to a Buick, the “hat” is an old style and would agree, incorrect. On the aeromotive website the monte/Malibu hat is correct. However after taking the pump out, the spongey foam crap they use surrounding the pump is already deteriorating, another wtf aspect of...

I apologize Chuck, I misinterpreted your question about talking about this before, is there any chance you could msg me directly?

UPDATE: all pump wiring checks out, filter taken off and it seems good as well, easy to blow thru. Put a hose on the line pre filter and ran the pump, again low volume IMO, same as the fuel rail amount of volume coming out before. The line from pump to filter appears good so it’s looking...

Lol Chuck, no we have never discussed this before, I got aeromotive on the phone and determined this is a gen II Buick GN setup, and if you look on their website, sure enough it’s ventless when you zoom in (no clue why anyone thought ventless was a good idea). PN 18449. Tank is down and...

New UPDATE: went to drain some fuel from the tank to eliminate the possible fuel in the neck issue, when I put power to the pump it barely was making a sound, and I noticed the volume was way low, it took like 20 min to drain 4 gallons….that isn’t right. It’s so weird that it can build 40+ psi...

The regulator is definitely seeing good vacuum, so reason to believe that line has an issue, I’ve inspected it, looks fine. As far fuel lines, that’s next on the list. I will look into that tester just because that’s great to have on hand. But I do not think vacuum leaks is the issue at this...

Quick video showing what’s happening

None, I am not in it long enough to let that happen, 5 psi boost is enough acceleration to make this happen.

Lol, mine is way worse, by the time I’m doing 45 mph at 5 psi boost, fp is dropping thru 10psi. Keep in mind, this is a new tank, and new 340, and I had run three passes at the track with no issues, it was on the ride home this pressure drop started happening again.

Chuck, I don’t know the PN, and I would agree it’s not the correct version, it was recommended to me by a long time reputable Buick shop. I won’t name drop that just yet as I have to get them on the phone to discuss this issue. I am still working replacing all cracked vacuum lines, but I’m...

Tested the regulator, adding air to the system caused pressure to rise accordingly. I’ve ordered a bunch of vacuum line and fittings, going to try to replace all of this 34 year old rubber in the next couple weeks.

Tbh, not sure, I assume the button/ diaphragm pulls itself in when a vacuum forms in the tank

This is a pic of the top of the tank, there is no vent line. Venting occurs with a “venting” cap, non original type of a cap.

Thanks for the replies, tank is vented via the cap. The tank itself is a aeromotive stealth. It does not have a third line coming out the top.

My IAT just dangles near where the canister would be….word I got years ago is the fuel correction wrt to iat is negligible. Please, someone who programs chips, chime in here…

New fuel filter installed after this issue first started, I thought it fixed it….like I said drove to a track, made three passes with no issues but on the way home it reared its ugly head again….baffled