wrd1972

iTrader: (12)

Okay I installed a new fuel pump recently, and now my tank is not venting through the EVAP and building up pressure. When I take the gas cap off, a tremendous amount of air is released from the tank.

The EVAP valve on the intake is working, and the air-line from the EVAP valve back to the EVAP canister is not clogged. EVAP canister seems fine too.

Are these rubber hose routings correct? Where does the RED routing go?

wrd1972

iTrader: (12)

Where does this thing factor in:

Z28Roxy

iTrader: (4)

I think in your first picture #2 on the evap canister that you have going to is is supposed to just be open not going to anything (fresh air inlet).

Here's a picture of an LS1 gas tank that someone made the LT1 evap system work with. See, just an inlet for air.



I think your red line (to fuel pressure/vacuum relief vent) goes to the fuel tank vent valve that you have #2 from the canister going to currently, see like this (from a thirdgen):



And I think the "to evap canister" fuel line goes to the UFO valve coming off the canister, you can see it in the first picture. Here's a diagram as well:

Full Power

I don't know the "right way" for your local emission laws, but a 3/16" hole in the fuel filler cap relieved tank pressure on a chevy pickup with a Walbro 255LPH in tank fuel pump.