Theoretically speaking

[2boosted]

I got some bugs that I can't get rid off, so I'll post some theoritical cases here to go elimitating them.

I have a huge concern on the Fuel System. Since my Digital Gauge havent arrive, I cant check pressure all the time.
But each time I go to the Gas Station to fill the Sucker, A huge sound of de-pressurizing comes out when I realease the cap. Is so nasty, that I place myself under the truck to see if there's something wrong, and the tank looks IMPLODE.

The bottom of the tank is arcked outside in, like when u get a Gatorade Plastic bottle with a lot of thirst and u suck the MF and bends towards the inner side....just like that looks my tank. I just replace the Gas Cap, but same result!!!!!

Any sugestions on this matter?

[SCIV]

Sounds like a vent line problem?

[RedHeartbeat]

I thought it was supposed to do that?

[badseed91]

evap purge solenoid? <-- have seen this once Tank vent? <--99% of the time especially 4x4

[RedHeartbeat]

Oh yeah, the evap isn&#39;t turned off in your PCM is it?

[2boosted]

Yeap, Allen Turn it off. So is normal to do that?

When I was young the tank was round and fat, now is skinny and contracted&#33;&#33;&#33;&#33;&#33;&#33;

[RedHeartbeat]

my tank is the other way, round and fat.

Turn the evap back on and it may help fix your problem. I assume you still have the evap solenoid on the engine.

[2boosted]

assuming I know what is that and where it goes, I&#39;ll never took it off, just the EGR is gonne, so I guess is in the engine, I;ll turn it on to see what happens...thanks

[RedHeartbeat]

normally it comes off the side of the throttle body to the solenoid on the driver side of the valve covers. It&#39;s actually clipped onto the top of the intake manifold on an Fbody.