The Stovebolt Site Forums The Shop Area General Truck Talk Fuel Sending Unit

I need to change the gas tank sending unit, but checking websites, they offer with and without venting. I noticed that the one installed on my truck, has and "L" tube that goes out of the flange. Is this the venting. The truck has the fuel line to the pump connected to this vent. Is it how it is supposed to be. If I buy a non venting sending unit, I don't see where to get the hoses to the pump. I noticed also that the tank has a small hole in the bottom, mine is plugged. Is this hole for the hose to the pump or the one on the sending unit. I'm really puzzled.

Is this for our 50 GMC pick up? Does it have the original gas tank inside the cab? I think that the original gas tank is vented through the cap and the 1954/5 they changed it to a vented tank. This is just a guess, but it would help if you posted pictures and or the year of the truck.

In '54 the supply line was moved to the sending unit. Earlier trucks had the supply line on the bottom. Sounds like you have the '54 and later type.

I have never heard of a vented sending unit. As far as I know all these trucks are vented through the cap, outside the cab. I wouldn't want a vented sending unit in the cab.

Cletis is on the money...that's one of the updates or advancements in design G.M. made.

The tank is vented through the cap. I didn't understood the sending unit description on the vendors website. The sending unit that my tank has has the flange with a bolt for the wire conection and a 90º elbow that is connected to an "L" shaped tubing that goes in the tank, where the reostat is attached in the middle. The guy had the fuel line that goes to the pump, attached to this elbow. What I noticed is that the sending units of the websites some have this elbow and others don't. Which would be the one to choose? The tank, as I told, has a plug in the lower part (I guess is for draining, rather than for the fuel, but dont' know). GMONIZ, this is the 50's-56 salad truck. I don't know if the tank is 54 or later, since I don't know the difference between this and the earlier type. I'll try to take a picture tomorrow, to post.

Thanks

there's no such animal as a vented sending unit, the one you have is what's right for '56 - like this - the "vent" is where the gas line hooks up, the earlier tank drew the gas from the bottom of the tank, so no tube on the sender

Bill

Ok Squeeze, so if I decide to let everything as is, I should by a sending unit for 56, if want to go for the year of the truck, I should remove the plug from the bottom of the tank and feed the lines from there, right?

Use the '56 one.

Ok. Thanks