MILLS Posted May 5, 2021 Share Posted May 5, 2021 pulled fuel tank from 83 F150 single cab and single tank ( ruined a carb with sludge). there was of course the filler neck hole and the sending unit hole but also a small hole in top of tank. what is it for and should it have a rubber plug in it Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted May 5, 2021 Share Posted May 5, 2021 Welcome! It is for what is commonly known as the rollover valve. It is a vent, set in a grommet, that connects to the evaporative emissions canister. It acts as a check/float valve as well. So if the tank is filled up into the filler neck, raw fuel won't end up in the engine. And if the vehicle flips over in a crash it will not pour fuel out. Link to comment Share on other sites More sharing options...
MILLS Posted May 5, 2021 Author Share Posted May 5, 2021 Welcome! It is for what is commonly known as the rollover valve. It is a vent, set in a grommet, that connects to the evaporative emissions canister. It acts as a check/float valve as well. So if the tank is filled up into the filler neck, raw fuel won't end up in the engine. And if the vehicle flips over in a crash it will not pour fuel out. so there should should be a vent and grommet, I will check for the parts. thanks Link to comment Share on other sites More sharing options...
kramttocs Posted May 5, 2021 Share Posted May 5, 2021 Jim beat me to it Hey Mills, That is for the Fuel Vapor Valve. Take a look here: http://www.garysgaragemahal.com/fuel-vapor-valve.html It will have a grommet and then the valve. I am not finding a great diagram (Gary may know of one) but this kind of shows it: Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted May 5, 2021 Share Posted May 5, 2021 Jim beat me to it Hey Mills, That is for the Fuel Vapor Valve. Take a look here: http://www.garysgaragemahal.com/fuel-vapor-valve.html It will have a grommet and then the valve. I am not finding a great diagram (Gary may know of one) but this kind of shows it: Link to comment Share on other sites More sharing options...
Gary Lewis Posted May 5, 2021 Share Posted May 5, 2021 Jim beat me to it Hey Mills, That is for the Fuel Vapor Valve. Take a look here: http://www.garysgaragemahal.com/fuel-vapor-valve.html It will have a grommet and then the valve. I am not finding a great diagram (Gary may know of one) but this kind of shows it: This one may be slightly better. And even though there were differences in the valves, as Jim pointed out, they all work and install the same. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted May 7, 2021 Share Posted May 7, 2021 Our member Jonathan posted this great pic of his new rollover vent. He also left this link. 40-1955 VENT VALVE-1 PORT BRONCO 80-96 40-1241 SEAL-VENT VALVE BRONCO 80-96 https://www.lmctruck.com/1980-96-ford/gas-tanks-parts/fd-1980-96-gas-tank-and-components Link to comment Share on other sites More sharing options...
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