For all intesive purposes, lets call the truck an 85 W350

Probably a dumb one, but here goes. Im looking at my gas tank and I see three steel fuel lines that run the whole length of the frame. Obviously the largest is the fuel supply line. One of the smaller would be a return and the other, as best as I can figure is a vent. The two smaller ones arent hooked to anything, being as my engine is a transplant and the fuel delivery system is not stock. The only one currently used is the fuel supply line. Soon, I will need to use a return line, and I cant seem to figure out which is which. Does it even matter? All three lines end at the frame in the engine compartment, and a rubber line is attatched from the supply to the carb.

 

the medium one is usually the return line and the small one about the same size as vacuum line is the vent that is normally hooked up to a charcoal canister.

 

Hmmm. and in the event of not having a charcoal canister? Should I just put a small air cleaner on it, to keep stuff from going in or out?

 

i am not really sure. the only thing i know is you can not plug it. if you plug it on hot sunny days it will force gas out of your gas tank into your engine. i know this is probably the reason my 81 has such great compression but such low oil pressure when warm. someone had plugged the vent line and and the engine literally filled with gas. had to remove the plugs to get the engine to turn over and there was about 3 quarts of gas in with the oil when i changed that.

 

Wow. Thats crazy. Glad it didnt wash your cylinders too bad. Good thing you said something. Currently, I have mine connected to each other. The return just has a length of hose going to the vent to the tank. In effect, it is a closed loop. Guess thats one of those simple things that I didnt think about. Duh... Gas tank needs to breathe.

 

ya. it is not really something you think about till it happens to you. i just wish i had the money to replace all the bearing in my engine. i think it would be happy with just that. i can't complain about 150-170psi of compression.

 

That is really good compression. I hope mine is that good. I just did all new bearings in my 5.9 that is going to be in my truck. I also did rings as well as "honed" the cylinders. I used one of those spring loaded three stone, hones. The guy that installed my cam bearings for me, said my hone job looked great and said to expect my rings to seat perfectly. Im trying to build on a budget as money isnt exactly flowing like it used to for me. I would have to total all the receipts, but I would figure I am about $500 into it. Not too bad for a full rebuild (minus machine work). I probably should have had him polish my crank, but I didnt. It looked fine to me, and he said he didnt see any issues. I used King bearings and Hastings Moly rings. Both are very popular brands with good reputations. Gaskets are made by Victor Reinz.

 

Its kinda funny that you are the one that responded to my question. When I was searching for it online, before I asked, the only info I came across was something you had posted on another forum about 2 years ago.

 

I am guessing you found those posts on dodge talk. I know I have posted about sending units over there multiple times.

 

Your guess would be correct.