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Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Hello guys I have a 88 Pontiac Firebird I'm doing the carb Swap and I just installed the three-way return style regulator for the fuel and I noticed that the back has no connection to the return line can anybody help me to determine which one will be the return line ? thank you
You get bonus points for using fuel-injection hose clamps.
You did notice the disconnected line near your UFO???
It also looks like only half of your UFO is there.
2 of your fuel lines are looped together.
what is that UFO thing used for?
I had put a in tank fuel pump to the 3-way return style regulator. turn the power on the bird and smelled gas and follow it to this spot and now i know that thats the return line pouring out fuel so im going to follow the lines from the top of the tank on down and use one of those lines to make a vent for the tank aswell .
thanks guys
Last edited by illuminati; 05-14-2018 at 10:55 PM.
It is a 2-way valve. It is supposed to let air in as gas is consumed,
AND release excess pressure should it build too high (safety).
Normally the vapors are supposed to go to the charcoal canister and
get burned by the engine when started. There should be a canister purge valve
or solenoid near the canister. You most likely have the solenoid controlled by the ECM.
I had put a in tank fuel pump to the 3-way return style regulator. turn the power on the bird and smelled gas and follow it to this spot and now i know that thats the return line pouring out fuel so im going to follow the lines from the top of the tank on down and use one of those lines to make a vent for the tank aswell .
thanks guys
The return line on the sender is the only one to go to the bottom of the tank. If there is some gas in the tank blow into each of the unknown lines with the gas cap off.
The one that causes the gas to bubble is the return.
The one that has a restriction in it is for the CCP system.
The one that has no restriction and causes no bubbling is for the UFO/mushroom valve.
05-14-2018, 03:06 PM
