I cant fill the truck up without it shutting the gas nozzle off no matter what position the nozzle is in, Also when the tank is fially full the truck doesnt run very well till the truck gets down to about 3/4 of a tank.
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Try not putting fuel nozzle in so far. Fuel flow cuts off on back pressure of the air being displaced by the fuel when filling. Can be a problem with narrow neck tanks and some fuel fillers are more sensitive than others.
Gas as in gasoline or gas as in LPG gas? If its petrol, the fuel sender may be out of adjustment. (Usually means a new sender) If its LPG, the fuel stations are set to automatically shut off at 80% full. The gas tank will never actually be full to the brim but the gauge should be showing full if the gas nozzle keeps shutting off. Have a look on the LPG tank itself, they have a little gauge on them which shows how full it is. I have 2 tanks on my car , when "full" or when the pump shuts down, the tank gauges show just under full but the gauge on the cars dash shows full (2005 BA Ford)
Due to the different shapes of fuel tank filler necks in cars & trucks, it may be necessary to vary one or more things to allow fuel to flow uninterrupted until the tank is really full.
The main problem can come from the new "vapor recovery" gasoline pumps. These pumps and hoses actually recover gasoline fumes from your tank as the liquid gasoline displaces the air / fumes in the tank is it is being filled. If gasoline flow is started at full blast, it can splash back slightly, causing liquid to be pulled back by the pump - so it shuts off. So, start with a slow rate of filling and gradually increase flow rate to maximum over 5 to 10 seconds. If it still shuts off, try some of the suggestions below.
First, don't fill at maximum flow rate from the pump - that is, don't set the nozzle for wide open. Select one of the other "latches" on the handle instead of the fastest flow and let the tank fill entirely at this rate.
Second, you should experiment a bit with the length of nozzle that you push into the tank's filler neck. If you push it in too far or too little, the pump nozzle can do what you're describing.
Third, try twisting the nozzle slightly so that it doesn't hang straight downward - a little to the left or right may provide a solution.
Lastly, try a different gas station. Their pumps may not be so picky with your tank's filler neck.
normally the pump stops the nozzle from pumping gas,your gas tank is full. bypassing this safety feature is not reccomended as the tank will become over pressurized and eventually you will smell gas around your vechicule due to a blown seal between the tank and filler neck.
on the nozzle of the dispensers there is a safety kick off, this will activate whenever gas splashes back into the nozzle. there are two ways to make this not happen, the first is back the nozzle out so it does not have gas splashing back into the nozzle or find another gas station that have different nozzles.
It souds like the air return line from the fuel filler pipe is plugged. When you fill up the car the air has to escape from the tank or else the fuel backs up into the filler neck shutting off the fuel nozzle. The air pipe is housed in the fuel filler pipe and lets the air escape as the fuel is going into the tank. Remove the filler neck and inspect air bypass line to see if it is kinked or plugged.
I have seen the same issue, the nozzles click off at some stations, others do not. One thing that I have tried and had a bit of success with is pressing the nozzle real tight against the filler hole. The rush of air coming up the filler neck is what clicks off the nozzle, not the fuel. So, pressing in tighter seems so let the pressure equalize in the filler neck. Try it, maybe it will work for you.