I got a 92 f-150 and i want to pull the front tank becasue i never use it. Im wondering is there any special tools i need like for disconnecting fuel lines, and do i need to do something special to cap off the line once im done? Just checking before i go ripping it out I dont know if there is a process to doing it on these electronic fuel pumped vehicles or not.

 

you just dont use it? or it doesnt work? well to remove it youll need i think a 9/16 wrench or deepwell socket. to unhook the harness youll need a flat head, and to pull the retainin clips a pair of plyers. just undo the straps, undo the harness, fuel lines move tank, unclip straps, tape up harness, and you might want to tape up the lines too. wiretie the hoses and wires up and your all good. if the tank works, you could sell it to someone on here.

 

why are you taking it out if the only thing is you not using it? leave it in there, for resale purposes, and for just having it in case, you know? It's part of the truck, and why mess with it if it's not broken?

Ryan

 

Well i dont use it and the gas guage is bad so Im taking it out because I am going to the exaust right through there. I get 200 miles from 3/4 of a tank in the rear so what sthe poin in using the front tank too? It takes gas to haul gas so I figure get rifd of it and run pipes and be done with it. I dunno i dont use it anyway because the sending unit is bad so imk just looking to cap it off the right way.

 

The check valves for the dual tanks are contained in the sender, so I'm not sure how you would be able to cap off the lines and hold pressure.

 

Thats not good.....I was affraid of something like that.

 

Fuel injection systems run at high pressure, and use special fittings instead of the good old familiar barb and worm-gear clamp arrangement (which won't hold).

There are special tools for removing the flexible connectors (the tools look sort of like a pair of scissors). These can be bought at the auto parts stores for $4 to $10 or so.

It is possible to get the fuel injection connectors apart with a screwdriver, provided you understand how the connection works. But you won't, at least not if you are on your back underneath the truck and this is the first time you are trying to separate the connector. Buy the correct tool, it makes it so much easier. You need it to change your fuel filter anyway.

The fuel pressure lines and fuel return lines to the two tanks are wye'd together at the frame rail. Each tank has a check valve on the supply line and a shuttle valve on the return line. If you want to run without a tank, you will have to plug both the supply and the return lines that used to go to that tank. Don't try to get by just stuffing a bolt into the flex line and clamping it down with a hose clamp. It won't hold the pressure and isn't safe.

The best bet would be to go back to the steel "hard line" Wye fittings on the frame rail. Disconnect the now unused front tank hard lines, and replace them with invert flare plugs or pipe plugs. (The correct plug to use depends on the nature of the Wye fitting. I've never had one apart to look so I'm not sure). A decent old-style auto parts store like NAPA has a big set of plastic drawers full of brass Weatherhead or Edelmann fittings, and you should be able to find the right part to plug the unused ports on the wyes.

The tank also has a vent line running up to the carbon cannister. The vent line needs to be plugged as well. This is under a much lower pressure, so the bolt and clamp arrangement is OK.

Be sure to fire up the truck and check carefully for fuel leaks after you are done. Also make sure to block off or otherwise idiot-proof the fill port to the former front tank so some future gas station attendant, or your well-meaning buddy, etc doesn't inadvertantly try to "fill 'er up" through the door to the front tank.

Since you are in California, you should check that the emission control inspection station will not fail your truck for tampering with the fuel evaporation control system, or for the new exhaust system you propose.