Quote:
Originally Posted by Mikester
**NOTE: THIS IS A ONE-WAY CHECK VALVE. ONCE YOU REMOVE THE VACUUM LINES FROM THE CANNISTER IN THE ENGINE BAY, THERE IS NO LONGER VACUUM ON THE FUEL TANK TO RELIEVE NEGATIVE PRESSURE CAUSED BY FUEL PUMP SUCTION, OR IN-TANK FUMES. IF YOU DO NOT REMOVE THE CHECK VALVE VACUUM LINE & VENT THE TANK TO ATMOSPHERE, IMPLOSION OR EXPLOSION COULD RESULT!!!
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As I expected I knew some information would be flawed.
The fuel check valve works as an equalizer for the fuel tank. On hot summer days, there will actually be positive pressure that will accumulate inside the tank. If you only install a one-way valve (vacuum) or keep the fuel check valve but block off the fuel vent, you will have problems. And by problems I mean premature fuel pump failure.
The fuel check valve will release a little bit of fuel vapor when the pressure exceeds X amount of psi. The fuel cap is vacuum only for S13's. If you vent to atmosphere with no fuel check valve installed, then you basically have an open system and moisture will creep into the tank and then you can say hello to a rusty S13 fuel tank for me.
If you want to block off the fuel vent, you can, but you must install an OEM S14 fuel cap because that acts as a two-way valve just like the fuel check valve.
Personally, I have an S14 fuel cap and a functioning fuel check valve so that way if one fails, the other is there as a fail-safe. I left the factory hard lines alone so it vents out right where the charcoal canister was. Been running it like this for 6 years and no IMPLOSION/EXPLOSION has occurred (like you are implying).