Smel of gas in my garage when thank is full, no leaks

The float in the gas tank may be sticking & giving u that false reading. They should of brought this to your attn when the job was done. The shop that did the job should be able to at least give u a diagnosis of your problem. That PART wont be warranted w the job but as "professionals" u can ask them to cut u a break. Good luck

Sounds like you've sprung a leak somehow. Check to see if any gasoline is leaking. You should be able to smell it if it was.

Something wrong with the pickup tube on the pump.

Sending unit gas gauge in the gas tank has gone bad and will need to be replaced. The gas gauge wire is grounding out causing you to have full full indicated and when there is no ground you get empty signal.

This is caused by the gauge in the tank having a bad spot on the float, which is common from wear and tear. Also if your lucky, it may just be the wire harness from the gas tank to the frame might be the issue and will need to be replaced. It worst, it's going to be the sending unit it self.

Thank you for using fixya and good luck

Sorry. Got to drop the tank. Just break the gas tank bolts and replace them with new ones. If the straps are badly rusted, replace them, too. Look for tank leaks on the top of the tank. Replace the sock on the fuel pump.

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.

Sounds like the 'float' is stuck. This is a small lever in the top of your fuel tank that rests on top of the fuel. When the fuel level drops, so does the 'float' and then it sends a different voltage to the guage, which in turn shows less fuel. It's an easy repair, but requires dropping the fuel tank to get at it. If your not experienced with this procedure, most any repair shop can do it. Try to run out most of your gas first, though, so that you don't 'lose' it at the garage! Good luck. Let me know if you need directions to do it yourself.

if the gas is leaking from the top of the tank, 10 to 1 it's either the fuel line, or the top part of the sending unit which is probably made of plastic, is cracked where the fuel line connects to.The tank should be empty or near it, easier to drop, loosen the tank strap bolts towards the front, then remove the rear ones one at a time, as you take the last rear bolt out, the tank should drop a little. Becarful of the wire connection and fuel line, drop it slowly enough to reach in and disconnect them.If the unit has a plastic hose connection, it needs replacing. good luck.

The reason that the shops keep insisting on a low tank is because gasoline weighs about 7.5 lbs per gallon. It's too heavy to remove full. Aside from that, most shops just don't have a place to temporarily store that much fuel! You almost certainly have a leak on the top of the tank, either from the sending unit seal, a hose or the tank itself, which is why it only leaks when full. The location can only be determined after the tank is taken down and inspected. Though most warrantys cover 90days from when work is done, any reputable shop will usually correct this type of problem for free, Unless there was a problem they saw, told you about and you refused to allow them to correct.
With regards to your heating problem: From your post, it sounds like the blower motor may have failed.(going over a bump would free it up) However, the motor itself would have been noisy before it got this bad. I don't see a corrolation between ambient temp and that though. Is the blower running when this happens? Also, If you don't have a proper antifreeze mixture, the heater core could be freezing up, but this would generally correct itself as the vehicle warms up. With limited info, I would not rule anything out yet!
Good lucki

sending unit in tank is bad need to drop tank and install new.