filler neck modification

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I've read through this thread a couple of times and I still don't see that there's a definitive solution. If I'm wrong, please let me know what the solution is.

I'd like to get mine sorted out before I have to deal with it on a running car.
 
I talked with Layson's and they do not sell the fuller tube mod as a kit. I may still give it a shot though. I have a spare filler tube for the core charge and they have everything 20% off right now. If it'll keep gas off the new paint, it's worth every penny.
 
Sure. Probably won't order it for another month or two. Got to start budgeting for holidays and the Mopars at Big Daddy's show is this weekend.
 
Fairly new to this forum and just recently took deliver of a 70 Duster, so I apologize if this issue has already been addressed. My unfortunate story relating to the fuel filler is when I tried to fill up the car here in California as soon as I hit the lever I was met with a stream of gas coming back at me past the emissions bellows that are mandatory here. Tried to reposition the nozzle, but was met with the same results. This led me to only putting 2 gallons of fuel in it, which took me a little over 5 minutes. Has anyone had this problem and if so developed a fix for it? I am at the point of getting 5 gallon gas cans and filling the car in this fashion.
 
Thanks for the link. I no longer have any of the emissions related components and I have an aftermarket tank from Hot Rod City Garage. Seems to me the problem is the filler neck. If I run the gas really, really slow it goes in, any increase in volume it cones right back out.
 
FYI, My 66 Dart has no issue with gas going in. Really, no mods. I turn nozzle with hose facing up and it works very good. About half speed on feed. In california with smog nozzle.
 
Going to give it another try tomorrow, but not confident that I am going to be able to get gas in at a decent rate.
 
Flip the nozzle upside down is what I believe hes referring to. Eric L
 
I'm not so sure. The idea of the fill nozzles we have here is to capture the air displaced by filling the tank. I'll grant that the air has to get out for the fuel to go in, BUT the car's evap system isn't designed to handle the volumetric exchange rate of filling the tank.
 
prorac1 said:
Flip the nozzle upside down is what I believe hes referring to. Eric L
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Yes I am. thanks for clarifying. And I need to keep seal from sealing, keep finger between body of car and nozzle. Other wise it keeps shutting off while filling.
 
I cut my filler neck in half and welded in the restrictor/trap door from a 2001 Toyota Forerunner. Then I welded it back together and ground down and dressed the welds and had it replated. You can't even tell it's been modified from inside the trunk.

I've only filled the tank twice so far. Both times it clicked off only when it was full. I topped it off just to prove the tank was full and spilled some gas. But if I had trusted it I would have had a perfect fill and zero spillage. i haven't noticed any signs of gas leaking out of the fuel tank while driving, but I haven't driven it much yet either.
 
PocketAces said:
I cut my filler neck in half and welded in the restrictor/trap door from a 2001 Toyota Forerunner. Then I welded it back together and ground down and dressed the welds and had it replated. You can't even tell it's been modified from inside the trunk.
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Where does the line form to send you two filler necks (one A-body and one 4Runner) plus money to get back one filler neck modified as described?
 
I can hold the nozzle at any angle, pump at any speed, and only get about six gallons in before having to wash gas off the quarter panel.

I still don't see a definitive answer, either. I could live with backsplash if I could get the tank anywhere near full, first.

The vent on the tank is not clogged, I do not have a return line or charcoal cannister.... but why would the vent care where it vents to?

I like to think I'm reasonably intelligent, but I just don't get it...so far.
 
To be honest, I was going to use a funnel to gas up, but found it was not needed. Im in the minority I guess.
 
Mopar Tim said:
To be honest, I was going to use a funnel to gas up, but found it was not needed. Im in the minority I guess.
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wonder about an alum can that will bairely drive into the filler tube, that has a pump nozzle size hole in the center of it. also why not take an extra vent up to the air breather, with the afore mentioned one way valve in it, no can needed. ???????????
 
Was able to get fuel in the car, but still took a gasoline bath when the pump clicked off. There has to be a better solution.
 
OK... for my 64 Barracuda I took a piece of 16 gauge and used a hole saw to cut a disc and filed it to be the same diameter as the inside of the filler neck. Then I drilled a hole a bit larger than an unleaded nozzle a bit closer to the bottom than centered. I filed a U shaped hole in the top which allowed me to fit it into the filler neck and serve as a vent. I positioned it squarely just below the factory vent tube. A couple of spots of welds and it's good to go. I can now insert the nozzle, squeeze the handle open and put the little lever holder in place and when it clicks off add a little bit to top it off and I'm done. No more holding the nozzle at the proper angle in the filler tube and guessing how much to squeeze the nozzle before it clicks off and repeat until frustrated. The brown you see is some gas resistant coating I got from a friend who works on airplanes to keep the washer and welds from rusting. With this mod and a Damraider cap fuel annoyance should be gone. My other early As are gonna get the filler neck mod for sure!!
 

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KnuckleDuster said:
................The vent on the tank is not clogged, I do not have a return line or charcoal cannister.... but why would the vent care where it vents to?

.
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famous bob said:
also why not take an extra vent up to the air breather, with the afore mentioned one way valve in it, no can needed. ???????????
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I keep trying to tell you guys, the filler problem has nothing to do with the vent, whether the vent is clogged, working or even present. The problem is returning air back up the filler as the tank fills. Part of the problem might be modern small nozzles with the pressure turned up way too high.

Having said that, unless you construct a separate HUGE vent, especially for the filler, say 5/8 (no 10) or larger, the filler problem is right in the neck. On my 67, no problem so long as I'm a bit careful "where I fill up." There are at least three stations nearby are normally no problem, and a some others I don't know, and three or four I no longer go to. I've complained to all of them that give trouble, I might as well go around and talk to the rear of the building.
 
Yeah, the pressure on the pumps around here is atrocious! Newer pumps seem to be the worse.

The station near me that sells non-ethanol fuel has one pump I can use out of eight. All the others pump way too fast.



67Dart273 said:
I keep trying to tell you guys, the filler problem has nothing to do with the vent, whether the vent is clogged, working or even present. The problem is returning air back up the filler as the tank fills. Part of the problem might be modern small nozzles with the pressure turned up way too high.

Having said that, unless you construct a separate HUGE vent, especially for the filler, say 5/8 (no 10) or larger, the filler problem is right in the neck. On my 67, no problem so long as I'm a bit careful "where I fill up." There are at least three stations nearby are normally no problem, and a some others I don't know, and three or four I no longer go to. I've complained to all of them that give trouble, I might as well go around and talk to the rear of the building.
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I keep forgetting to post pics of the one I got from Layson's. It's really nice, and I like that they include a rubber plug with a twist lock, and the cup still allows for the vent tube to function easily. It's really well made, but it's definitely not cheap. If you are a good fabricator and can do it yourself with a welder, go for it. If you aren't, or don't have the time, this is an excellent alternative, and I'm very happy with the finished product.

The plug is an extra nice touch. It means 0 fuel escapage on hard cornering, which is great for a street/autocross car like mine.
 
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