Question about Hyundai Motor 2002 Sonata
This is perfectly normal. It happens because as the fuel goes into the
tank it splashes and bubbles. As the tank gets closer to being full,
the displacement caused by the bubbles forces the gas to go up the pipe
that feeds the tank and triggers the "full" switch on the pump nozzle.
This is similar to if you are filling up a cup of cola at a restaurant,
you have to wait for the fizz to die down before you can put that last
Other opinions comment most of the time the problem is the charcoal canister. Five things needs to be checked/fixed:
1.- a canister close valve could be clogged with charcoal or not working
2.- a canister filter
3.- electrical connection to the close valve
4.- broken canister
5.- a purge valve which pull fuel vapors from the canister
6.- all the hoses of canister should be open, means not clogged
I can hear about similar problem of pumping gas and have replaced the canister close valve, now they can pump gas without a continuous auto shut off.
Here I find and quote other comments about this "normal" shut off function...
Pal, you're going to need a doctorate to understand the following, so cleanse your mind of distracting thoughts. In a gas pump handle you have two valves: the main valve, which is actuated by the oversize trigger you squeeze to make the gas flow, and the check valve, which lets gas flow out but won't let anything back in again, thus reducing fire hazard. In the seat of the check valve you have a little hole. To the backside of this hole is connected a Y-shaped tube. One branch of this tube runs down the nozzle and exits at the tip while the other runs back to a diaphragm connected to a release mechanism on the main valve. When you squeeze the gas pump trigger, gas running past the hole in the check valve sucks air out of the Y-shaped tube. (This is because of the Bernoulli principle: a moving stream of fluid tends to pull things in from the sides. Take my word for it.) As long the end of the Y-shaped tube exiting at the spout is unobstructed, air is simply pulled into the tube and nothing much else happens. However, as soon as the gas in your car's fill-up pipe gets high enough to cover the end of the tube, a partial vacuum is created therein, which yanks on the diaphragm, releases the main valve, and shuts off the gas. If the gas happens to be especially foamy one day, it may actuate the release mechanism prematurely, with the result that you end up with less than a full tank of gas. Simple, huh? Sure, just like nuclear fission. Stick with English lit.
Posted on Aug 05, 2010
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Posted on Jan 02, 2017
there is 1 relay that controls the ECM / Fuel pump. its located above the center hump in the dash, right side. Like to the right and below radio area.
Posted on Oct 27, 2009
The reason the gas station pump shuts off is when the fuel reaches the tip of the gas nozzle, so when you are filling your car and the gas nozzle (gas stations pipe) keeps shutting off it means that the pipe that runs to the gas tank is not open completely, what happens is when you pump the gas in the car the supply pipe from the gas tank opening to the tank fills up quickly and this causes the gas station pipe nozzle to shut off, have some body take down the gas tank and have a look at the gas tank opening and also gas supply pipe that runs from the gas filler opening ( on the car body) to the gas tank. Have a look at it and please don't forget to rate the answer if it was helpful, thanks!
Posted on Mar 25, 2010
Ya, check behind the drivers rear wheel. There is a black box which contains the charcoal canister, filter, solenoid. You'll need to jack up the car, take that wheel off, mud flap and another plastic section inside the wheel well which will expose the hoses that run in and out of that box. . . . take note where all the hoses go. You'll need to remove the whole thing to get at the filter. The electrical lead that attaches to the solenoid has a unique locking clamp so its difficult to unplug, I opened the trunk and cut the wire where is runs into the wiring harness.(careful to leave enough wire to work with to re-connect it). The filter is hopefully the problem, its only around $10.
Posted on Nov 07, 2010
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