Gas spills when refueling

[MidnightBlueSwinger]

I go low tech.

I insert the fill nozzle, but leave it out an inch. I then take a couple paper towels and turn them into a big long fatty (420 man) then wrap it around the filler nozzle. Then push the nozzle the rest of the way in.

I also glow slower than the max and do not top it off

I'm gonna try this next fill up.

Couldn't one just get a large grommet and put it into the fill hole?
Kinda like a rubber sock you don't have to carry around and remove and toss.

Still doesn't solve the issue though.

I have a TanksInc tank, it has a separate vent nipple. It's connected to the factory fill tube vent, hard line up and around in the trunk, then soft line down and out into the frame, iirc.

Even if I fill it extremely slow it shoots out in the end, sometimes getting a full tank, sometimes not.

TanksInc tank came with a aluminum breather valve, but it needs to be mounted high, which would be in the trunk, no thank you, and I misplaced it.

My other thought, fill tube in my 62 Valiant is horizontal for a mile before it goes south.

Filling from a gas can one day, I stuck a hose on it to avoid wearing gas.

Maybe carry a hose that just reaches the full tank mark and stick it on the pump nozzle?

I tried the ¾" valve cover grommet, didnt work as i hoped.

Would you stuff a ¾"id x 2 ft fuel hose down the filler tube, then attach the hose to the pump nozzle? When I bought my 64 Falcon the PO said to attach a ¾" hose to avoid spills, I'm thinking thats what he meant. Does this sound right?

 

[toolmanmike]

Do we need to reduce the diameter of the fill tube by installing a restrictor or hose so it won't splash back? Will the automatic shut off feature on the nozzle cause issues there? You would have to fill it very slow or it would shut the nozzle off constantly. Or, is the issue caused by the shallow angle of the fill tube? My 64 Polara fills under the license plate and it splashes back because of the shallow angle. Not all over the paint though, which is good.

 

[MidnightBlueSwinger]

Check to make sure the tank vent is open and operating.
'66 and earlier with the small diameter filler necks are usually the ones that have issues "burping" fuel out onto the quarter panel- usually you don't see that with '67 and later unless there's issues with the tank vent, which is why I mention that.
Or just fill it a bit slower... nozzle doesn't have to be open 4 clicks, fill it at 3 and it'll only take a minute longer.

I don't see a vent tube in the trunk area, maybe mine didn't have one.

 

[MidnightBlueSwinger]

The nozzle operator controls if you will overflow. That can be you (treating it like a metal utility gas can laying on it's side) or the automatic shutoff if you equip the neck with the baffle (like the F350). There is a kit for this (somebody share a link?). The little holes should be at the bottom so any fuel that does get above the insert can still drain but a push in insert doesn't fully seal anyway. The insert depth should be set to allow the nozzle tip side hole to go past the insert. The nozzle diameter must also be a close fit to the insert opening. Here is a video on how the nozzle works: Utube pump nozzle shutoff design

You'll still probably leak a bit since the neck does not expand above the insert to form a cup and the angle of the neck doesn't drop like modern cars. A custom neck could drop a few inches initially and expand a couple inches (leaving the entry and cap stock), then run horizontal over the tank. The hinged flap is not needed. You want the nozzle side hole to stop getting air to shut off the pump.

I found this website regarding a restrictor, is this it?

SHOP BY CATEGORY | pollutioncontrol2

 

[matthon]

Would you stuff a ¾"id x 2 ft fuel hose down the filler tube, then attach the hose to the pump nozzle? When I bought my 64 Falcon the PO said to attach a ¾" hose to avoid spills, I'm thinking thats what he meant. Does this sound right?

None of it sounds right, not referring to what you stated specifically, just in general.

I wouldn't stick a hose onto a pump nozzle and squeeze the trigger outside of the fill tube.
I was thinking put the hose on the nozzle, then insert into the fill tube so it's down as far as it would be normally.

Even that sounds dumb, and that's coming from my brain.

I'm perplexed why my tank still spits out gas, with the stock vent above the fill tube, and a vent nipple on the tank.

Full throttle, tank fills, gas bubbles up.
Take it slow, exceeds the height of the tank nipple, air is pushed up and out the vent, gets to the filler vent part, should still be pushing air out.

The reality is even if I go slow it can puke, and after I don't have a full tank.

Vent is clear, filling slow, why isn't the air escaping?

 

[RustyRatRod]

I think it's the TINY size of the vent that's the main issue. More modern vehicles, even my 1975 Ford truck for example have MUCH larger vents on the filler neck. It uses a 5/8" hose that goes back to the tank. Unless I put the pump on full blast, it never over flows.

 

[matthon]

I think it's the TINY size of the vent

I was thinking that, I think.

Iirc the vent nipple on my TanksInc tank is larger, but I misplaced their fancy aluminum vent.

I wanted to mount 'high above the tank' as they stated, but that would be in the trunk, which I didn't want to do.

Or on the outside of the car, on the roof or somewhere stupid, like where tf is there to mount it other than inside the trunk?

 

[Dana67Dart]

FYI...

Our A body fill tubes has a huge vent inside the tube. It is the flat piece you see when you look in the tube.

The fuel filles under it and air can escape the tank above the flat piece out the inlet hole or the vent tube

Also the external vent tube comes out the filler very near the quarter and goes up then attached via a short rubber hose to a metal tube that runs back then forward then down by the filler tube out through the trunk floor into a frame rail.

 

[RustyRatRod]

I was thinking that, I think.

Iirc the vent nipple on my TanksInc tank is larger, but I misplaced their fancy aluminum vent.

I wanted to mount 'high above the tank' as they stated, but that would be in the trunk, which I didn't want to do.

Or on the outside of the car, on the roof or somewhere stupid, like where tf is there to mount it other than inside the trunk?

I'm going to add a larger vent to Vixen, but I'm unsure WHERE to locate the new vent in the fill tube. Up toward the top like the factory one or further down a ways? It would seem like maybe a bit further away from the fill hole would work better. That would allow it to vent before it got close to the fill hole. But I don't really know.

 

[Dana67Dart]

The reason they are at the very top is for air to exit the tube and not be able to create a syphon .

It's hard to see but the bumps are louvers. The wire is inserted into one of the louver holes. They all are at the top of the fill tube. They also help keep the fill tube inserted.

But basically the air exits above the flat piece through the louvers and out the inlet OR vent tube

There is also air gaps between the flat plate and the tube

The vent tube is visable at 9:00

Keep in mind that the filler nozzel has its own venting built into the nozzel so there is no real reason to vent the car more than the factory did

 

[Dana67Dart]

I don't see a vent tube in the trunk area, maybe mine didn't have one.

What year is your car.

The ones with charcoal canister vent differently

 

[RustyRatRod]

The reason they are at the very top is for air to exit the tube and not be able to create a syphon .

It's hard to see but the bumps are louvers. The wire is inserted into one of the louver holes. They all are at the top of the fill tube. They also help keep the fill tube inserted.

But basically the air exits above the flat piece through the louvers and out the inlet OR vent tube
View attachment 1716494653

There is also air gaps between the flat plate and the tube

View attachment 1716494654View attachment 1716494655

The vent tube is visable at 9:00
View attachment 1716494657

Keep in mind that the filler nozzel has its own venting built into the nozzel so there is no real reason to vent the car more than the factory did

That makes sense. Thanks. In that case, Up toward the fill hole and on TOP of the fill neck might be the best place to allow air to escape.

 

[RustyRatRod]

The reason they are at the very top is for air to exit the tube and not be able to create a syphon .

It's hard to see but the bumps are louvers. The wire is inserted into one of the louver holes. They all are at the top of the fill tube. They also help keep the fill tube inserted.

But basically the air exits above the flat piece through the louvers and out the inlet OR vent tube
View attachment 1716494653

There is also air gaps between the flat plate and the tube

View attachment 1716494654View attachment 1716494655

The vent tube is visable at 9:00
View attachment 1716494657

Keep in mind that the filler nozzel has its own venting built into the nozzel so there is no real reason to vent the car more than the factory did

And yeah, there's a LOT of reason to vent an early A body more. lol

 

[slantsixdan]

What year is your car.

The ones with charcoal canister vent differently

That's a very important point. The dome at the top of the tank must not be messed with (ventilated); it's there for a reason.

More info on the '70-'71 and '72-up vent systems here.