Leaking fuel tank
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Junior User
Joined: Mar 2013
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Well I guess this is a correction. Tank looks shiny like aluminum on top but a magnet sticks to it so it must be steel. Most stainless is not magnetic so just amazing to me this thing is as clean as it is. I will try soap sud trick.
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Put sending unit back in. I cut an innertube and capped the hole for filler tube with this and a hose clamp. I put air in the small nipple coming out of the sending unit and held my finger over the other nipple (larger one). I could hear air coming from the breather tube on top of tank. Soaped the top and sides and watched for bubbles. I found air escaping from the base of the small nipple where it is joined to the cap. I guess a new sending unit is in order but I can't help but think I could braze or solder this joint to prevent this from leaking. When tank is full this nipple would be a couple inches below the fuel level.
I guess I will need to repeat this check as the tank still had some fuel in it and when the fuel was covering the lower section of tank I would not see air bubbles as fuel would be escaping rather than air. I am sure my wife will help me blow air in the tank or wipe it with soap solution while I look for bubbles, its a very clean job after all because I'm using soap
I guess I will need to repeat this check as the tank still had some fuel in it and when the fuel was covering the lower section of tank I would not see air bubbles as fuel would be escaping rather than air. I am sure my wife will help me blow air in the tank or wipe it with soap solution while I look for bubbles, its a very clean job after all because I'm using soap
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Joined: Nov 2007
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From: Denver Metro Area, CO
I thought you had an impact gun? I assumed air-powered, and I also assumed you have a trigger-operated nozzle for blowing compressed air, you can use that to pressurize the tank. I put the nozzle in the filler tube and use duct tape to seal it up (trigger remains outside), bolts in hoses for the other connections.
You don't need much air pressure, a few pounds is all.
Yeah, a clean job cuz you're using soap, I like that.
You don't need much air pressure, a few pounds is all.
Yeah, a clean job cuz you're using soap, I like that.
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Joined: Feb 2013
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From: Texarkana, Arkansas
My 1985 F250 was leaking around that sending unit. Someone had it off and accidently did not get it flat and it was leaking because of the rubber ring. I purchased one at NAPA and that fixed the problem with the leaky tank.
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From: Virginia
If you do not want to mess with soldering or brazing, they have this stuff in the hardware store called "Seal All". It's a stinky clear glue and comes in a yellow toothpaste type tube. I had to hunt around a little bit, since I don't think I could find it a Lowe's, but a local hardware store carried it. It's supposed to be gas resistant, and sure enough, if the area is clean and you let it dry good after you apply it, it will seal against gasoline.
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