I have got a leak on top of the gas tank. When I fill it up, gas will run out the top when I park on sloped ground. In the last couple of days we have had lots of rain and the truck has been running like a dog. I suspect water in the fuel.
What all do I need to have and what might I find is the culprit leak?
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You may have leakings fuel line on top of gas tank when filling up or line is leaking where they connect to fuel filter under body maybe behind rear wheel wells , or may have a leaking furl injector or even your carbon gas canister filtr need chaging or ovver filling can send fuel up to that canister which recirculates gas fumes back to fuel system check your gas cap maybe leaking or when gas attended over filling it runs down into drain tube
There are two hoses running from the filler neck. Either of them could be leaking from the top. There is also a seal on the top of the tank where the fuel pump is that can leak. If your car leaks the whole time you are putting fuel in, I would suspect the hoses. If it only leaks when you get it full, then check the seal on the top of the tank. The top of the tank can be seen without dropping the tank. Remove your back seat and you will see a cover over the fuel pump. Remove that cover and you can see the top of the tank.
I believe you are referring to the shield under the tank, and yes, you can remove it w/out dropping the tank. I replaced my 2 tanks in a 90 F-250. The only problem may be corrosion, and trying to remove the bolts that attach the shield. Be careful, as you don't want any sparks due to the leak. Don't park or work on the truck inside. I was fortunate to replace mine on a nice breezy day, so any fumes didn't build up from the leak. I also ran the truck empty, had a can of gas with me to be able to make it home. You don't want to drop the tank with gas in it, it's too heavy and more dangerous. Good luck.
The float in your tank has gone bad, happens over time. Either reset your trip odometer each time you fill if you know how many miles you can get out of a tank or you'll have to drop your tank and replace your float. On the old Fords its not a huge job, just a pain. Make sure your tank is as empty as can be before you drop it though! I'm speaking from experience here...
sounds like you are going to have to drop the tank out to inspect and fix. with luck it will be leaking from the fuel pump seal or the return line.
Bad luck would be if the tank is rusted out and needs to be replaced.
Syphon as much gas out of the tank as you can before you drop it , gas is heavy.
the top of the tank has an opening where the gas guage sending unit is installed. The gasket can give out and it can leak when the tank is completely full, but won't necessarily show signs of leakage when the tank is partially full. Requires dropping the tank and changing the gasket... hope this helps.