Fuel tank issue = I don't like it and need a solution

[tc1959]

My 78 El Camino with the original tank does that, It always has, unless I manually fill it and not use the auto fill on the pump handle.

 

[1KWIKSIX]

Ditto
My factory Buick Grand National tank does the same thing too.

 

[69hurstolds]

Mine tends to spew out after about 18 gallons..... 🙂

I don't know why the Olds factory tanks would be any different than any other G-body with rear fill. I've never had it spew on me. But it may have something to do with the gas station's fuel pump pressures, flow, etc. I have mostly used BP gas stations to fill my G-bodies. Of course, I do try to keep the minimum 25 psi in the air shocks so raising the rear a little bit may help with tank burping. (that may be the only good reason to have factory air shocks. So dumb, GM, so dumb.)

 

[TURNA]

Mine tends to spew out after about 18 gallons..... 🙂

I don't know why the Olds factory tanks would be any different than any other G-body with rear fill. I've never had it spew on me. But it may have something to do with the gas station's fuel pump pressures, flow, etc. I have mostly used BP gas stations to fill my G-bodies. Of course, I do try to keep the minimum 25 psi in the air shocks so raising the rear a little bit may help with tank burping. (that may be the only good reason to have factory air shocks. So dumb, GM, so dumb.)

Some have necks that are bent differently

 

[81cutlass]

I bought a neck less tank for my GP. I filled the old fuel tank for my GP full of water and used a cutoff wheel to cut a square out of the tank where the neck was soldered to the tank. MAKE SURE YOU FILL IT WITH WATER!! Don't need anyone blowing up!!

Then I used a mini propane torch to heat up the joint where the factory soldered the neck to the tank, it is silver soldered so i had to heat it up a bit but it came out without to much issue. Took the old neck and new EFI GN tank to a radiator shop and they soldered it for like $25-$30 or something. I have no issues.

 

[Max Headroom]

What's happening is that the fuel going into the tank is creating air pressure in the tank because the air can't escape past the incoming fuel. When the pressure in the tank builds up enough, it will overcome the incoming fuel pressure and force the air out. The gas that is spewing is the gas that has not yet reached the tank but is still in the neck. This issue is common with the tanks that had an opening just big enough for the unleaded fill tube from the pump.

When the gas industry was transitioning from leaded to unleaded fuel, they sized down the hole in the top of the fill tube so that you couldn't put a larger leaded gas nozzle in the tank.

Some people drive something into the hole to make it larger or at least out of round. This will usually allow the pressure to escape fast enough not to spew. If you should try to do this and I don't recommend it, make sure you don't make a spark and or blow your ride and self up.

 

[mr84monte]

I forgot to ask, when did you buy the tank?

8 years ago but it was just put in the car in Feb.

I also noticed that they've added a roll over valve to the new sending unit, and the vent in the neck of the new tank new is actually larger.

 

[TURNA]

8 years ago but it was just put in the car in Feb.

I also noticed that they've added a roll over valve to the new sending unit, and the vent in the neck of the new tank new is actually larger.
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I was told by Spectra they have corrected the problem with the newer tanks

 

[Turbolq4]

I was told by Spectra they have corrected the problem with the newer tanks

Like how new? Mine is less than three years old and it spews fuel all over if you get in any hurry. The only time I'm grateful for the peanut sized fuel tank in these cars.

 

[TURNA]

No idea how new or if it is bullshit.

I called them like 2-3 months ago just before I bought mine to ask them about it