Dose anyone know how vent the gas tank in a early bronco better?
the pump at the gas station pumps so fast it shuts off every 5 sec.
takes me like 20 min to fill my gas tank.
Is there a way to fix this without buying a new gas tank? My fill pipe is clear i have removed it and checked a couple times.
anyone have this issue?
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1969 i think. Has a '74 glove box, 302, 3 speed on the floor, f150 springs up front, 2in lift leafs rear, 1966 Mustang 302, c4. Both under construction..
Its a Bronco thing. I've seen guys roll the left side up on blocks to help it. I usually stand there and control the flow. But sometimes, depending on the nozzle style, it will run on 1 or 2 clicks. I can fill 23 gallons in about 5 minutes.
If you have that canister thing on the right side of the frame behind the coil spring and shock at the front you should be able to get it to work. Mine is a ^%#$^#^$ too! If you have a shop manual for an emmissions car you should be able to look at the evap diagram and get it to work.
You need to run a line from the gas tank to allow the gas vapors to vent to the carb, through the evap tank (cannister on the side of the frame) which will allow the modern pump to work properly. Actually, all you need to do is run from the gas tank to evap tank to get it to work.
That's one of my projects too! I just havent got around to it.
will my fuel tank have the fitting to add in a canister vent. mine is a non-evap system car?
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1969 i think. Has a '74 glove box, 302, 3 speed on the floor, f150 springs up front, 2in lift leafs rear, 1966 Mustang 302, c4. Both under construction..
Your 74 had an evap system on it at one point in time. Do you still have the stock tank? Many aftermarket tanks have those lines too. My 23 gallon metal tank does. They are right behind the overflow line fitting.
I will check my 75 shop manual for Trucks including Broncos and see if I can find anything that may help.
How the system works is simple. You have the filler tube (big) overflow tube (smaller) and evap tube (smallest). The evap fitting is connected to the evap canister and then cansiter to the carb. The canister is supposed to save the gas fumes to be burned when the engine is running, allowing the carb to suck it down, usually through the vacuum port that only sucks vacuum when you are out of the idle circuit.
The evap line has a tube inside the tank that drops down an inch or so. When you are filling the tank with a pump, that gas is pushing the gas vapors in the tank into the evap canister to store them.
When the tank is close to full that evap line tube inside the tank is then submerged trapping the vapors in the tank and then causing the pump to shut off. That's how the pump knows when to shut off.
You could trick the system by t-ing off the overflow line with the t fitting pointing to the sky and then run a line to a canister at the front of the truck, but that sill be more likely to overflow, and you will really need to keep an eye on the rubber filler and overflow hoses.
If you have a stock tank/tanks you should have two lines for evap in front of the filler neck on the tank. There also should be a plastic container under a sheetmetal cover behind the driver's side seat in that cavity near the wheel housing. My 74 has all that, it's just not connected.
Actually, what shuts the nozzle off is when the vent is submerged or air causes fuel to block the pressure flow out of the tank. Try pinching off the vent hose and filling your tank. It will immediately shut off because there is nowhere for the air that is being displaced by the fuel to go. I understand that the Evap system will work to remove vapors built up in the tank by use and from the fill nozzle, but not instantaneously. The ports are too small for adequate flow for that purpose.
On a race Bronco I was involved with that used a 23 gallon tank, we cut a hole in the floor and welded a pipe onto the tank that came through the floor. With a stock sized fill pipe and vent, we never had any issues of backflushing or burping.
Rcrawler might have just given us all a quick fix, as long as you want to watch the pump and guess about how much gas you have in the tank.
You install a t fitting on the overflow line in the line and run another smaller house from tghe fitting in the fender well where you can get at it when you want, but mostly out of sight. You stick a plug on the end and when you are filling up you just pull out the plug and let the pump run!
As long as you watch the pump no problems!! If you don't you could get an overflow!
I know that i had a similar problem on my crew, and my bronco.
instead of just inserting the pump, letting it rest on the fill port, and squeezing the handle, i hold the pump up against the top, basically i'm holding it up the whole time, not too sure, but maybe i'm letting it vent out under the nozzle, i line up the nozzle to the same direction and angle as the fill hose, so its not all the way in, otherwise it changes the angle, i don't mean halfway out either cause you'll get overflow, but i'm about a inch from being fully seated, and no problems with the pump clicking off every couple seconds and no overflow either, as long as i hold it up, if not i have the same problem as you chesirecat.
Sorry not even sure if i'm talking about the same problem, maybe my 72 doesn't even have the evap tank problem thing you guys are talking about
also same problem and remedy on my 66 mustang
and some times maybe i get a crappy pump or something, but once in a while i'll have it happen to me on my expedition, same remedy, and no problems for the rest of the fill up.
hopefully this will work for you, i hate to see you waste time and money on such a dumb problem, i'm sure you would rather be wasting time and money on other areas of your bronco
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yea, i actully tried a different gas station and was able to get the tank to fill on the slow fill notch on the gas pump handle. Also i did tilt the pump nozzle to the side alittle.
I'll just have to watch what stations i go to because the one i had the bigest problem with just woulden't pump slow enough i guess. I'm still going to keep looking for a fix for this but right now like 76 crew said. there is definatly other areas on my bronco i want my money to go right now. thnaks
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1969 i think. Has a '74 glove box, 302, 3 speed on the floor, f150 springs up front, 2in lift leafs rear, 1966 Mustang 302, c4. Both under construction..
Twisting the nozzle like Mauicruza and 76 Crew is a good solution for the problem. It depends on the station, nozzle type, and where you're at to determine what angle works best. I can usually turn it to a 9 o clock position and get it to flow.
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