Fuel Line questions and issues...

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Pana.Mopar

Pana.Mopar

Duster Down Under
Joined
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Sydney, Australia
Hi All,

Need you expert assistance...

On my '76 Duster, now with 383 and 727 I've run into a couple of issues...

Took the car to gas station and went to fill her up and it filled about 3 gallons and did not want to fill anymore and just kept spilling back out..

I've changed two things since the car had it's original small block.

1. Put a Charger flip fuel cap on the car.
2. The Duster has three fuel lines on it in the engine bay. One was to the charcoal cannister (now gone), second I take it is the return and third is to carb.

I have blocked the first two which I take it is incorrect and I might be getting a lot of vapour and hence fuel issues??? The car originally had the charcoal cannister and fuel filter was Fram style with the return pipe but I have now put chrome inline direct filter..

Can anyone suggest any tips to the above dilemma's on how to cure my fuel system issues???

Appreciate the assistance and feedback...
 
Kinda seems to me like there is a kink or something in the filler tube.
 
Sounds like you have a emissions car with the extra tube next to the filler tube ?
There are three lines,1 is for fuel and the other 2 are for vapor and venting.
If you plug the venting of the tank you will have issues.

Usually you would have a vented gas cap or filler tube.

Sounds like your Charger cap is not vented.

Simple fix is to go to a vented filler tube.

Suprised your car is running at all the way you have it.

California cars came with this emissions package (extra tube in trunk).
I got rid of the tube and went with a vented filler tube and gas cap.
 
I couldnt fill up my old charger because of hole in top of the tank you might need to check it pretty good
 
Johnny Dart said:
Sounds like you have a emissions car with the extra tube next to the filler tube ?
There are three lines,1 is for fuel and the other 2 are for vapor and venting.
If you plug the venting of the tank you will have issues.

Usually you would have a vented gas cap or filler tube.

Sounds like your Charger cap is not vented.

Simple fix is to go to a vented filler tube.

Suprised your car is running at all the way you have it.

California cars came with this emissions package (extra tube in trunk).
I got rid of the tube and went with a vented filler tube and gas cap.
Click to expand...

Thanks for the advice. That's what I thought and makes perfect sense. Where would I be able to get a vented filler tube from? Or other option is I go back to the vented fuel cap which I still have..
 
If you unplugged the line that originally went to the charcoal cannister it might work as a vent. Seems like the easiest solution if the line is still on the car. You might put a plastic vent cover on it like is used on transmission, axle & transfer case vents on 4wd vehicles.
 
'64 Cuda said:
If you unplugged the line that originally went to the charcoal cannister it might work as a vent. Seems like the easiest solution if the line is still on the car. You might put a plastic vent cover on it like is used on transmission, axle & transfer case vents on 4wd vehicles.
Click to expand...

I've ordered a couple of Fram fuel filters with the return hose on it and I spoke to a friend and he said the same thing about the charcoal cannister line. Use the rubber house that was on the charcoal cannister and just leave it in the engine bay pointing up and it will vent fine... I'll give this a go in the next couple of days and see how it works out..
 
Yeah, try that first. blow some air in the filler, and see if it comes out the small hose.
 
Pana.Mopar said:
Thanks for the advice. That's what I thought and makes perfect sense. Where would I be able to get a vented filler tube from? Or other option is I go back to the vented fuel cap which I still have..
Click to expand...

Not really familiar with the Duster filler tube. But if a 70-72 Duster filler tube will fit your car,they usually are vented.

You can take the tube out,and vent it yourself.
Ive heard of people drilling a small hole in there non-vented gas caps.
Or like you said,put your vented cap back on.

64 Cuda had a good suggestion as well.

Think of it like a gas can. You start to pour gas into the lawn mower,hardly any gas is coming out. Oh,shoot,I forgot to open the vent....Voila !!!!
 
Johnny Dart said:
Not really familiar with the Duster filler tube. But if a 70-72 Duster filler tube will fit your car,they usually are vented.

You can take the tube out,and vent it yourself.
Ive heard of people drilling a small hole in there non-vented gas caps.
Or like you said,put your vented cap back on.

64 Cuda had a good suggestion as well.

Think of it like a gas can. You start to pour gas into the lawn mower,hardly any gas is coming out. Oh,shoot,I forgot to open the vent....Voila !!!!
Click to expand...

Still got this issue happening where I try and fill the car up and I can only get a 1/2 gallon of fuel in and then it stops and spills out of the filler and also noticed that a minute later I saw fuel leaking from somewhere around the tank. Ended up putting correct fuel filter (Fram) with return hose and also have the breather line open where it went into the charcoal cannister... Thought this may cure the problem. Check the filler tube in the boot and it doesnt have another tube next to it. It looks like the breather tube goes into the tank above where the sender unit/fuel/return lines enter the tank... I'm baffled about this...??? Got compressor and blew air thru both of these and fuel poured out of the filler tube so seems like there's no blockage in the lines...
 
Pana.Mopar said:
Still got this issue happening where I try and fill the car up and I can only get a 1/2 gallon of fuel in and then it stops and spills out of the filler and also noticed that a minute later I saw fuel leaking from somewhere around the tank...
Click to expand...

You definitely have a venting problem. If fuel is kicking back out of the filler neck when you fill the tank then the vent is blocked. Crawl under the car and disconnect the vent connection at the tank and blow air from a compressor into the disconnected line (also disconnect the charcoal canister). Have a helper listen at the other end of the line in the engine bay. There is an overfill limiting valve in the vent line, it may be plugged with gunk. You also need to blow air (with open gas cap) or run a piece of bailing wire into the vent inlet nipple on the tank and make sure it is not plugged. If you can get air moving freely through the vent line reconnect at the tank but leave it disconnected at the charcoal canister. Try filling your tank, if this works then I would place a simple filter over the end of the vent line and call it good. This is all assuming you are using the correct 1976 fuel tank and filler tube. May want to ensure fuel is not leaking at the filler tube to tank gasket. If it is you need to replace it.
 
Demon 408 said:
You definitely have a venting problem. If fuel is kicking back out of the filler neck when you fill the tank then the vent is blocked. Crawl under the car and disconnect the vent connection at the tank and blow air from a compressor into the disconnected line (also disconnect the charcoal canister). Have a helper listen at the other end of the line in the engine bay. There is an overfill limiting valve in the vent line, it may be plugged with gunk. You also need to blow air (with open gas cap) or run a piece of bailing wire into the vent inlet nipple on the tank and make sure it is not plugged. If you can get air moving freely through the vent line reconnect at the tank but leave it disconnected at the charcoal canister. Try filling your tank, if this works then I would place a simple filter over the end of the vent line and call it good. This is all assuming you are using the correct 1976 fuel tank and filler tube. May want to ensure fuel is not leaking at the filler tube to tank gasket. If it is you need to replace it.
Click to expand...

Thanks so much for the advice.. I'll give this a go today. I noticed this little plastic unit connected to the vent line under the passengers side floor and wondered what it was???
 
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