I've decided to re-locate my 2nd tank. Its current location is right behind my t-case and next to my rear drive line. The filler rests on the frame in the fender well. Whoever hooked it up did not add a return line for the 2nd tank. I assume thats common, but while running on that tank the return goes back into the main tank again. My question is how much fuel can be expected to return to the main tank out of the 10 gallons? I assume to answer this you need to know I own a 77 CJ-5 with 304ci and Motorcraft 2bbl. The fuel pump runs off of the distributor. Thanks in advance!!
P.S. CJ owners, if you'd like to see pictures of how and where they installed the tank, let me know. I'd keep it there but I'm planning to re-route my exaust to that area to tuck the muffs.
Shaggy

The answer depends on how long you run the tank.If you only run the tank a couple of blocks to get to a gas station to fill your main tank it may only put a couple of quarts into the main tank. If you run around on the trail on it or around town, the whole tank minus what the engine burns will transfer to the main tank.

Usually my main tank covers all the wheeling but I don't have enough to get home. That is when the gas cans get dumped in. (right now my second tank is full of mud, due to my tires throwing rocks at the gas cap and un screwing it). The rest of the day I spent slinging mud and water in there. I was wondering if something was going to happen like that after I bought the Jeep. Anyhow, it is about 70 miles from one of the wheeling places I go to (Browns Camp, Oregon) to home. At 10 miles to the gallon, and a 70 mile trip, do you think that last 3 gallons would ALL go back into the main tank?
Shaggy

i still think a couple of jerry cans would be simpler. if you need alot more, you can buy a 15 gallon container. KISS!! (keep it simple stupid)

i still think a couple of jerry cans would be simpler. if you need alot more, you can buy a 15 gallon container. KISS!! (keep it simple stupid) <quote> aaronlosey

I already have the extra tank, so why your out in the weather pouring in gas and getting it all over yourself, all I must do is reach under the seat and flip a switch. My way seems to be the simple way :flipoff2: I'm glad to see you graced me with your opinion though :rolleyes:
Shaggy

Is your main tank bigger than your aux. tank? If so, just run off the main tank until it's empty or nearly so, then switch to the aux. tank and run that until it's dry and switch back to the main tank. While running off the aux. tank, the return line will work to transfer fuel into the main tank. The only potential pitfall with this setup is running the aux. tank with a full main tank. The return fuel would overfill the main tank and pour out the filler neck.

You might chainge fuel filters,to one with out a return.Or you coud just chainge tank switching valves,ie.chevy, and install a fitting in the aux tank.Then you can run a line from the valve to the aux tank.

There ya go Grampa Jeep. Heres what I'll do: Let the main tank run out then switch over to the secondary. After that one runs out I will see how much is in the main tank "from the reading off the gauge". Once I have a ballpark figure of how much I actually have left when the secondary is low, I shouldn't have any problem figuring out if I have enough gas at any point on the trail or highway. Now if I can only get my main tank gauge to work. Ahh, hell, I'll fix that when I re-locate the aux tank. Thanks for all the help.
Shaggy