My truck is on level ground and triple checked on the type of pump. When I take the gas cap off air comes out for 10secs cause its so built up in there. I'm going to guess its from the air pressure inside the tank. Tomorrow I will mess with the tank and see if I can get it figured out.

 

Are you using the same fuel cap as before? Try leaving the cap off and starting it, and see if it will run...make sure you have a vented cap. Also not sure if it was mentioned here on not. Do you know if your tank was hooked up to charcoal canisters earlier? Sounds like something didn't get hooked back up correctly from the reinstall.

 

I figured out the problem thanks to the help! There was so much air pressure in the tank it pushed the gas up to the carb. which all leaked down through the engine. I will need to get a vented cap. Thanks for the input!
Now that this problem is fixed another has seemed to come up....
The truck still isnt running right. I'm wondering if it has to do with the gas that has run down into the oil (which I'm def planning on changing asap) and the engine? Anyone else think this is the problem?

 

Would definitely think it doesn't help it any

 

Do it soon and change the plugs. When changing the plugs, squirt some oil into the cyls(small amount) to lube the rings up while you are changing the rest of them. Hopefully the rings didn't get washed out. Check for blowby change or oil consumption.

 

You should have changed the oil before you even started it, did you check it?

I bet it is WAY overfull!

 

The dipstick def reads overfull because of the gas that got in there. I'm not starting it again until this is all figured out. Couple questions though....

Do I absolutely have to change the spark plugs?
and Do you think my carbs gasket could be ruined from this?

 

I would pulled every plug and see what condition they are in. Clean if necessary, but definately make sure they are dry. IMO the carb gaskets should be fine. But do not run it again until the oil has been changed. If it was my truck, I would change the oil again after 100 miles.

 

Okay after a week of investigating and researching I've figured out a few things but I have also come up with a few good questions:

1.) My gas tank has so much pressure in it that it pushes fuel up through my carb. while the truck is off (At least this is what we think). I talked to a very experienced mehanic and he claims even if there is alot of pressure from the tank pushing the fuel to the carb, the carb shouldn't be letting the fuel in because the float and needle should keep it from doing so. Is this completely true??

2.) We decided I should get a vented gas cap. Now how can you tell if your cap is vented or not?? From what I understand vented caps let air into the tank to push the fuel. I've also read that vented caps let air out if the pressure is too high but some disagree. So which does it do? or does it do both??

3.) If vented caps do allow pressure to build in the tank to push the fuel, is my problem the carb. needle and float not keeping the gas out? or is my problem both the cap and the carb??

I really appreciate everyones help on this and hope it helps others as well, because I'm learning this lesson the hard way. This has given me more problems than ever imagined.

 

1. With enough pressure the seat can be pushed open, espically if the needle and seat is worn.
2. Vented caps allow air in to keep from forming a high vacuum. But they will also vent most of the pressure in the tank, you should still have a pound or two of pressure as the air temp changes, but using fuel will help keep this in balance. This all happens slowly and were only talking a couple of pounds of pressure, like a person blowing into the tank. Not enough to push the fuel needle open. But you should also have a charcoal canister to help control fuel vapors and pressure. Maybe the wrong tank was installed?

 

I recently took the stalk tank off and had it refirbished because it was leaking. It was sealed in and out at a highly reputable business. The truck ran fine with the refirbished tank for at least 3 weeks. Then this happened.

The charcoal canister I have no idea about. Where should it be loacated? and would it solve the problem of the pressure build up or will a vented cap solve the problem?

Again how can you tell if a gas cap is vented or not?

 

If I may I will try to chime in here, fuel cap will be marked, vented. If you took a hose and put a hole in the side of a can, and your hand on top of the can and began to suck on the hose you would feel the hand pull in toward the bottom of the can, to prevent (no pun inteded) this a vented cap is used thuss preventing the tank being sucked together. Now if your cap is good then I would look toward the tank vent line being pluged.This vent is plumed from tank to the filler neck, this aids in fill the tank and helps to prevent that hatted fuel back splash, you know the one that happens when you have your good clothes on and going out! YES you can over power the needle valve that shuts off fuel once the bowls are full of fuel. The fuel system for a carb type system is less than seven pounds, so immagine what 15 or more pounds in the tank could do. The last thing I wish to say is that fuel in the oil never good, but if you only ran it for a moment or two you may not have hert it. think about it like this, you can use gas to wash oil off parts, and we know we need the oil on those parts to prevent metal to metal failure. OH heck I lied to you one more thing, plugs, see if you can find a sand blaster in your area and clean them, if not use some eather and dry them regap and plug up then play. BUT NOT JUST YET. you need to reset the float, all that pressure bent the copper tang on the float and you be in a flood condition. Now that you finished all this you should be good to go.