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I'M INSTALLING A FUEL TANK UNDER THE BED ....behind the rear end , I'm thinking I could need a flex hose between the tank and the frame ..55 first 3100 ....any thoughts ???? Also do I need to use copper or steel for the line ????

I like steel for the gas line.

I've never put in a tank like you have but I have seen many of my friends and checked them out at car shows.
If the neck is not long enough from the supplier then a hose connection is the ticket. I got my hose for the panel from NAPA as they have the real deal.
Should the neck be to long then I've had friends that cut the neck off and join back with a piece of hose rather than try weld it.

.... and some use the flip up lid, some use the recessed cup like in a kitchen sink.

Now with all that said you may have to adjust the tank up, or down, to suit your needs and adapt/tighten the mounting straps so as to keep it there. In the end either way you choose should be fine.

Thanks ... but I'm talking about the supply line to the fuel pump . I know there's a fuel hose from the factory under the cab ....I guess because the cab moves , [shackles]...my fuel tank is solid on the frame ....

If you look at any vehicle there is a rubber hose between the tank and the line going forward. I've changed a few dryrotted hoses by the tank when a vehicle won't start and someone has already changed the pump. Then when it doesn't run they start asking questions.

I guess I'm not clear on this .....does the gas line at the tank need a rubber hose , for vibration , frame twisting and other movement ....I'll put one on just to be safe ....

Wanderer, it was a behind the rear axle, under the bed that I was talking about. Since its under bed I was thinking you were going to come straight up through the bed with the gas fill up tube....... Sorry for any confusion its my mistake. Should have read a little bit closer!

By all means put a short piece of rubber as you come from the tank going to the fuel pump. There needs to be a little flex in there somewhere.

Thanks Achipmunk ,

I opted for steel line from the tank, along the frame, to the rubber hoses that sweep up to the engine. Since putting that in, I've had to remove the tank once or twice. Mind you, this is a 1951 Suburban. If you went hard line from the tank forward, you would have to give some thought to maintenance. Does the pickup come out of the top of the tank. The sender comes out of the top of tank. If you have an in tank pump, that will have to come out of the top of the tank ( as is the way my set up is.) So, with your truck, you'll need to ask yourself, will I want to drop the tank to maintain it? Or will I want to remove the bed? On mine, I can get just enough clearance to disconnect the fittings. But if I were to do it over again I would probably use hose as removing a Suburban body is not an option and having hose there would make dropping the tank so much easier.

Here's a link with some photo's of how I installed a rear frame mount gas tank. It also has part numbers for all the parts I used, including fuel line. Hope that helps. http://talk.classicparts.com/showthread.php?p=88322#post88322/

Some new cars have the fuel filter near the tank. If I was doing it I would have a steel line from the tank pickup go to a fuel filter mounted on the frame rail close to the top of the tank. Then to remove the tank I would remove the line going into the fuel filter and drop the tank. Don

Don, Check out the link I posted in the previous post. Other than using a flexible line from the filter to the tank you've described exactly the method I used.

Here's a direct link to the photo that shows the orientation of the gas tank and the fuel filter. http://i645.photobucket.com/albums/...%20Photos%20Oct%202009/2009_10200007.jpg

http://talk.classicparts.com/showthread.php?p=88322#post88322/