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shifty · 05-17-2019, 02:19 PM

So ... How hard is it to drop the tank in a GMT400?

Got my Tech2 and problem seems clear. Tank pressure sensor always reads an outrageous vacuum level whether truck is running or not, gas cap on or off. Bad FTPS, I'd guess?

Tech2 won't even run EVAP tests "Too much fuel tank vacuum Test Aborted". Here's a short video of test attempt and longer video of evap/fuel readings of Tech2 display while truck is running if interesting.

Fuel pump has been buzzing like a MF for at least a year now. Guess I might as well swap both at the same time while tank is dropped?

Looks like tank just has two straps and a frame brace holding it in. Guessing 15mins + jack to drop it. Any tips/warnings? Like, ground cables to remove, wires or lines to loosen, etc?

05-17-2019, 02:19 PM	#21
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	Re: P0446 mil So ... How hard is it to drop the tank in a GMT400? Got my Tech2 and problem seems clear. Tank pressure sensor always reads an outrageous vacuum level whether truck is running or not, gas cap on or off. Bad FTPS, I'd guess? Tech2 won't even run EVAP tests "Too much fuel tank vacuum Test Aborted". Here's a short video of test attempt and longer video of evap/fuel readings of Tech2 display while truck is running if interesting. Fuel pump has been buzzing like a MF for at least a year now. Guess I might as well swap both at the same time while tank is dropped? Looks like tank just has two straps and a frame brace holding it in. Guessing 15mins + jack to drop it. Any tips/warnings? Like, ground cables to remove, wires or lines to loosen, etc? Attached Images __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. Last edited by shifty; 05-19-2019 at 08:08 PM.