Gas tank help
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Junior User
Joined: Jan 2006
Posts: 82
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Gas tank help
Hey everyone, I recently got a side fuel tank and want to install it on my 78 so i have extra fuel capacity. What is the best way to do it? Can I do it with out having to put to the fuel sector valve in or can I run just a gravity feed into the stock fuel or should I put it where it dumps into the rear tank. Any suggestions would be awesome.
Posting Guru
Joined: Aug 2002
Posts: 1,729
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Your going to have to have a selector valve so you can pump out of the tank. The only way you could gravity feed the tank would be to connect the bottom of the two tanks with a line, not recommended.
You could put a electric pump in the new tank and send the discharge to the old tank, but sounds like a hassle
You could put a electric pump in the new tank and send the discharge to the old tank, but sounds like a hassle
Postmaster
Joined: Aug 2000
Posts: 3,312
Likes: 1
From: Eldorado Ca. USA
If you set it up so it dumps into the rear tank, you will probably will drain that tank, instead of fill it. Also, the tank you are filling does not talk to the pump to shut it off. You can overfill it, and dump gas all over the road if you forget the process is going on. Bite the bullet and install a manual transfer switch on the floor. there is a spot there already marked on the floor. Go to the JY and buy the valve, assuming your truck has a switch, or is only one tank. If it has the valve already, you need to buy one that is a 3 way.
Elder User
Joined: Apr 2006
Posts: 688
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From: Elk Point; Alberta
What you would like is a system like is found in semi's right ??? Problem is if you look at a semi the fuel tanks are fairly close to straight across from each other. In our trucks the tanks aren't orientated that way so fuel will come out of the easiest source (likely the tank closes to the pump) first which will cause a vapor block in the system once that tank is dry. The tank switch eliminates this issue. I imagine with some engineering you could make the system work without a switch but at what cost ???
Postmaster
Joined: Aug 2000
Posts: 3,312
Likes: 1
From: Eldorado Ca. USA
Install a manual valve. Go out to your truck, climb underneath it on the drivers side. Look up at the outer most edge of the floor, about mid span of the seat. There you will see a two small (3/16) and one larger (5/8")areas pressed into the cab. Those are the factory knockouts for the manual fuel switch. Find a factory switch, install and plumb it, your problems are solved.
This is the electric valve
it sits underneath the truck, location not important. You have to wire it to a switch to correctly allow teh fuel gauge to read on the right tank.
This is the manual valve that you need. The big hole I told you about is for the main portion of the switch, the two smaller holes are for the bolts. There is a cover plate that is not shown(and not included it looks like) that is needed to properly secure this.
This is the electric valve
it sits underneath the truck, location not important. You have to wire it to a switch to correctly allow teh fuel gauge to read on the right tank.This is the manual valve that you need. The big hole I told you about is for the main portion of the switch, the two smaller holes are for the bolts. There is a cover plate that is not shown(and not included it looks like) that is needed to properly secure this.
