My current set up incorporates an in-tank Walbro GSS342 which supplys the standard 1UZFE fuel rail and pressure regulator, returning the unused fuel to the bottom of the tank. So far pretty normal.
Originally my Volvo ran fuel injection and had a charcoal cannister with a return line to the tank. The 1UZ doesn't have this. This unused return line I've just looped from the tank to the fuel filler neck breather. The filler cap allows air in, but not out.
So now the system is fully sealed and as a result, the tank becomes pressurised but I'm unsure how much pressure is normal. Should there be a pressure release valve incorporated into the system or leave it as is?
Originally my Volvo ran fuel injection and had a charcoal cannister with a return line to the tank. The 1UZ doesn't have this. This unused return line I've just looped from the tank to the fuel filler neck breather. The filler cap allows air in, but not out.
So now the system is fully sealed and as a result, the tank becomes pressurised but I'm unsure how much pressure is normal. Should there be a pressure release valve incorporated into the system or leave it as is?
