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Fueling problems
Topic Started: May 28 2017, 02:57 PM (1,002 Views)
Stringbean
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Hey everyone, so I'm having some issues when filling my 93 Swift GT up and wanted to see if you guys have any ideas. When I go to pump gas it will cut it off as if the tank is full, to put gas in I have to barely squeeze the handle. Also while filling the car "burps" gas out of the filler neck. After doing some searching here on the forum I found that it might be my breather tube is clogged or rusted filler neck. Took the filler neck off, blew air through the breather tube and it seemed fine not resistance and no rust on the filler neck. Only one little tiny rust hole on the breather tube, which actually gets covered up by the rubber hose that attaches to it. I wouldn't think that the tiny hole would cause the problems but I'm not sure. Here is a pic of the hole on the breather tube Posted Image
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ptcapboy


once in awhile when the gas clicks off on me when I know it's not full yet I will pull the nozzle out a few inches and that usually does it-I've also noticed when the pumping is very slow (like when the stations tanks are low) the auto shut off won't work and gas will come out
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suzukitom
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Tom

I have a 90 GT. The small pipe is just a vent back to a fitting on the tank.

Did the problem just start happening?

Have you tried another gas station? Some pumps have more sensitive shutoff mechanisms and nozzle designs.

The angle of the pump nozzle and depth of insertion into the car's filler neck makes a difference also.



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Stringbean
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I've only had the car for maybe a month and tried multiple gas stations all with the same thing happening, also tried putting the gas nozzle in at different depths and angles to no avail. When driving the car home from buying it gas actually leaked out from where the rubber tube connects to the filler neck although I put a new clamp on there and it stopped leaking. Still "burps" gas out and cuts off extremely fast :hmm
Edited by Stringbean, May 29 2017, 08:30 PM.
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Stringbean
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Anybody have any other ideas?
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suzukitom
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Tom

Something to check could be whether there may be a blockage/restriction in the breather hose going to the top of the tank. This is a picture of the new tank before I installed it into my 90 GT.


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91 ragtop
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Try sticking a hose down inside the tank with the filler neck off. If it doesn't go all the way into the tank there might be an anti siphon valve in it that is plugged up.


Ken.......
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Stringbean
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Thanks for the replies and ideas guys I'll check those out
Edited by Stringbean, Jun 1 2017, 09:03 PM.
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Stringbean
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Well finally got around to dropping the tank. The breather hose was definitely pinched on top of the gas tank. Moved it to a position where it didn't looked pinched, went to the gas station to fill up and still having the same issues although it does seem like it takes long before the pump cuts off, and still have gas "burp" outofthefurnace filler neck. Thinking the breather hose gets pinched when I fully tighten the bolts that hold the gas tank up.
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Stringbean
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Forgot to add that I stuck a hose down the fuel tank like 91 ragtop suggested and it did go all the way in, so don't think it's any issue with an anti siphon valve. While I had the tank off I completely took off the breather hose and blew air through it and there was no blockage or restriction.
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suzukitom
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Tom

The breather hose should follow the route shown in the picture I posted. There should be zero pinching of the hose by the tank as there is normally lots of clearance between the floor pan and the top of the gas tank as well as alongside the filler pipe/ hose.

If the breather hose is not clogged I would check if there may be a blockage in the breather fitting atop the rectangular fuel pump door that is bolted to the top of the tank
Edited by suzukitom, Jun 13 2017, 01:08 AM.
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ptcapboy


thought about this topic the other day when I read the "car talk" column in Friday's auto section of the Seattle Times-a guy had the same problem and the guy (Ray is it-the surviving brother) told him to check the vapor canister thing under the hood and the line that goes to the tank and explained how the problem can cause the symptoms you're having-don't remember the specifics-perhaps you can google "car talk" and pull up the article-
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Stringbean
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Suzuki Tom- I pulled the breather tube off the fuel pump door and there seemed to be no blockage air went through without resistance. Also took off the fuel pump door and all was clear no blockage.

Ptcapboy- I think this is the article you are referring to? http://www.seattletimes.com/nwshowcase/automotive/faulty-vent-valve-likely-triggering-gas-pumps-to-shut-down/ If so I checked the lines to the canister and all seemed ok but could it possibly be the canister is clogged?
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Moringa
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Living BOT

I read the article, and it does make sense. If this is the case, then you should be able to remove the "vent" line from the tank to the EVAP canister, right at the firewall, and try fueling. If this fixes the problem, then the canister is probably restricted. I'd first check where the air vents in, at the bottom of the canister I believe.
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ptcapboy


yep-that's the one and it looks like moringa answered your next question very well which is good cause I don't know the answer-hope you get it soon-
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