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Fuel tank

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MILLS

Fuel tank

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

Mills 83 F150 4X4 4SPEED

ArdWrknTrk

Re: Fuel tank

Administrator

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.

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

MILLS

Re: Fuel tank

so there should should be a vent and grommet, I will check for the parts. thanks

Mills 83 F150 4X4 4SPEED

kramttocs

Re: Fuel tank

Administrator

In reply to this post by MILLS

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:

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio

ArdWrknTrk

Re: Fuel tank

Administrator

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: Fuel tank

Administrator

In reply to this post by kramttocs

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.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

ArdWrknTrk

Re: Fuel tank

Administrator

In reply to this post by MILLS

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

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.