Gs 300 Filler Neck Problem

[peter hausberg]

I am having trouble fueling my 2000 GS300. The pump nozzle clicks off immediately after begining to gas up....and keeps clicking off every time I squeeze the pump handle.

Anyone else had this problem? Any suggestions?

Thanks for any help you can give.

[TurboGS300]

Go to another gas station <_<

[peter hausberg]

Go to another gas station <_<

←

Believe me, I have.

[TurboGS300]

Go to another gas station <_<

←

Believe me, I have.

←

I believe it's usually a pressure sensing that shuts off the pump. Make sure pump nozzle is fully seated inside the filler neck, push it in tightly.

[GuyTelefunken]

Actually I would recommend you pull the nozzle out a bit. My theory here is that as you fill the tank with gas, the air in the tank is forces out the filler neck. It is this displaced air that causes the pump nozzle to sense the tank is full. If you pull the nozzle out a bit, approx. an inch, often this seems to create a small gap between the fill hole and the nozzle allowing the extra air pressure to escape. For whatever reason, the shut off feature still works. But do be careful when filling up at a station that has older/less maintained pumps. If you pull out too far, it'll go all over the place. No pun intended

[TurboGS300]

Here's how it works!

When your gas gauge reads empty, your tank is filled with air instead of fuel. As you add fuel, the air must move out of the tank to make way for the gas. Next time you fill your car at the gas station, take a look at the pump nozzle. You will find a hole about a half inch from the end of the nozzle. This hole is connected to a small pipe that travels through the nozzle to the handle.

When you fill your gas tank, some of the displaced air flows through the hole in the nozzle into the pipe. When the tank is full, the hole will be below the gasoline level and no air will pass through the pipe. A mechanical switch inside the nozzle detects when the flow of air stops and shuts off the gas.

You may have noticed that, after the pump shuts off, you can get more gas in your tank by pulling the nozzle out of the tank a bit. This is because you’re moving the position of the hole relative to the gas level and allowing the mechanical switch to reopen.

Conklin also explained how the replacement of the hole controls how full the tank can be filled. <_<

Some toyotas have had this problem as well, their may be a TSB on it, probably not. You can also rotate the pump nozzle 45 degrees in the hole so the hole in the nozzle is on top. B) I would try it both ways fully in and out a little bit, as well as rotating the nozzle. There's a spot in there where the gas is backing up into the hole in pump nozzle causing the pump to shut off.

[peter hausberg]

Thanks to everyone for the advice. I have tried different gas stations and have maneuvered the nozzle in every way possible.....but most of the time the nozzle shuts off 1-2 seconds after pumping begins.

Note that here in Calif., the pumps use a vapor recovery system (big black rubber boot over the nozzle itself that seals with the top of the filler pipe). Maybe that has something to do with the problem.

[914lps]

My Saab does the same thing. Some gas stations fine. Others nothing I can do. I have to pump about 1/4 gal at a time!, As pump keeps poping off. Some stations I have to put it in upside down. Others I need to hold it to the right. Others to the left. Some times I can pump the gas fast. Sometimes I have to go very slow or it pops off. A real pain. I know it is becouse of the shape of the filler line on my car. On th pumps that i need to find the "right" way to hold it. If I move it just a small amount.. Pops off. On some sations I need to hold the hose coming from the pump just right.... I feel your pain.

If your car has done this from day one, I know of no fix. But if your tank has a "over flow" tube you my want to check that it is clear.

[mitymouse]

This will take a little longer, but fill your tank slower: Use the first click on the pump handle. The slower the flow, the smaller the back-pressure from the tank. CA is a beeyatch w/ their recapture boots. MO has the same thing. I live in KS where we have good old fashioned pot-metal pipes but I've noticed even with these, I have less mid-pump shutoffs if I fill slowly. Fill your tank slowly, patiently and take refuge in the fact that you will have less high-pressure shut-offs, and more importantly, you will salvage your charcoal canister. Frequent high-pressure shut offs will kill your canister (like it did mine thank to the prev owner) and this will set you back $750. Forgive the cliche but when filling a Lexus tank, "slow and steady wins the race." pax