moparblood
Well-Known Member
i used the electric choke kit 1232! works great!,easy hook up! but when van sits over night the fuel bowl empties out! WHY?
Fuel Bowl empties when stops!
- Thread starter moparblood
- Start date
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383Scampman
Well-Known Member
Leak somewhere
dano
Evil Handy Man
Evaporation.
69_340_GTS
Well-Known Member
Welcome to the world of ethanol-laced gasoline. It happens to everything with a carburetor these days.
moparblood
Well-Known Member
Well that sucks! but i will check deeper for leaks, nothing stood out other wise.
Donnie514
Well-Known Member
Motor is under the "dog house" and retains a lot of heat.
Gasoline now days sucks !!! Low boiling point.
Your area of New York most likely just switched to winter blend gas and that's a rapid boil over on a van and six cylinder
Mo pars.
The R.V.P. sucks on the winter gasoline.
Gasoline now days sucks !!! Low boiling point.
Your area of New York most likely just switched to winter blend gas and that's a rapid boil over on a van and six cylinder
Mo pars.
The R.V.P. sucks on the winter gasoline.
TrailBeast
AKA Mopars4us on Youtube
You didn't say what carb is on it, but some carbs have soft plugs in the bottom of the bowl area and the fuel leaks into the intake.
The Rochester Quadrajet is one.
What are we workin on here, a damned refrigerator? More info man, more info.
moparblood
Well-Known Member
78 dodge van slant 6 carter 2bbl
slantsixdan
=..=
Do the Fuel line mod, make sure you've got the correct thick carb-to-intake insulator gasket, and get some effective heat shielding under the carburetor.
How have you proven that the bowel is empty?
I wouldn't think all of the fuel would be evaporating completely. Not just overnight. My guess is the fuel pump is bad and somehow allowing fuel to gravity feed back into the fuel supply line. Pull the dipstick and see if it smells strongly of fuel. If it does, the diaphragm in the pump is letting fuel run into the oil pan. Put a fuel pump on it If not, when you park it to let it sit overnight again, take a pair of vise grips and gently pinch the fuel supply hose from the tank to the pump closed. But make sure it is closed completely. If it starts the next morning, then the fuel pump is allowing fuel to run back into the supply line. Put a fuel pump on it.
It does in my AFB on my 66 Dart. All gone overnight. Installed a electric pump with a bypass setup, no more issues now...
moparblood
Well-Known Member
Gotta Love this forum. i will pinch the hose to see if fuel pump is bad, then will do the fuel mod Dan says!
Donnie514
Well-Known Member
Those fittings are not really available any more. Check out amazon. They have the 822550 but currently not the 721550.
Google Dorman 492-024 and Ever Brass 1791 I found them just a few months ago at a good price, no not GOOD price but cheaper.
Google Dorman 492-024 and Ever Brass 1791 I found them just a few months ago at a good price, no not GOOD price but cheaper.
slantsixdan
=..=
Donnie514
Well-Known Member
If you decide to move the fuel line away from all the heat this is what I will use on my own 6 cylinder.
I am not doing mine tell it goes in the garage for the winter, but I have the needed parts. I do not like the rubber type hoses to be that long so I will use # 6 braided and the fittings I found at Summit.
Aeroquip----FBM 1137 is straight, FBM 1143 is a 90 degree and FBM 1155 is a 45 degree. You only need two of these.
I am not doing mine tell it goes in the garage for the winter, but I have the needed parts. I do not like the rubber type hoses to be that long so I will use # 6 braided and the fittings I found at Summit.
Aeroquip----FBM 1137 is straight, FBM 1143 is a 90 degree and FBM 1155 is a 45 degree. You only need two of these.
Charrlie_S
Well-Known Member
I have seen this posted before, by other people.
I have always wondered how a bad fuel pump can allow a float bowl to drain. The fuel inlet needle/seat in the carb is higher then the fuel level in the carb.
I have this same problem on my 84 D-100 with a Carter bbd if it sits for more then 2 days, but I have not looked into the reason, yet. My 64 Valiant with a holley 1920 could sit for over a week, and start right up.
TrailBeast
AKA Mopars4us on Youtube
It's not possible for the fuel to get sucked out of the bowl/s by drainback.
It is possible the fuel is running from the needle and seat back though.
But even if the fuel ran back it would still have fuel in the bowl to start and run unless it evaporated. (which happens)
An electric pump solves both.
This is a morning cold start with an electric.
Donnie514
Well-Known Member
Hey Trail Beast,
First off that is not a 225 c.u. 6 cylinder that you fired up.
This is a post on things to do and try on a 6 cylinder van or car. Have you ever looked at where Chrysler routed the fuel line or how they mounted the carburetor directly on (3 inches) above and bolted to the exhaust manifold collector and heat riser.
Our problem is the shitty gasoline. To much corn in it now. This is NOT a drain back problem, its a boil over and flooding problem. My God I can drive mine tell it gets good and hot, which is normal operating temperature, shut it off, let it sit for a bit, open the hood, look at my carburetor and watch it boil over.
First off that is not a 225 c.u. 6 cylinder that you fired up.
This is a post on things to do and try on a 6 cylinder van or car. Have you ever looked at where Chrysler routed the fuel line or how they mounted the carburetor directly on (3 inches) above and bolted to the exhaust manifold collector and heat riser.
Our problem is the shitty gasoline. To much corn in it now. This is NOT a drain back problem, its a boil over and flooding problem. My God I can drive mine tell it gets good and hot, which is normal operating temperature, shut it off, let it sit for a bit, open the hood, look at my carburetor and watch it boil over.
TrailBeast
AKA Mopars4us on Youtube
I didn't notice this was in the slant section, sorry.
All else still applies to all engines, heat and ethanol fuel as you know.
And yes, I know exactly how the fuel lines are routed on a slant, and that they can be rerouted to help solve fuel heated in the lines.
Another thing that does help is a return circulation fuel system, as it keeps the coolest possible fuel available at the carb.
This won't help the fuel heat soak after shutdown though.
The reason I mentioned the drain back problem is because two other members brought it up in this very thread.
Donnie514
Well-Known Member
Ya, They think it is the fuel pump diaphragm. A flooding carburetor, or a bad choke pull off will also put gasoline in the crankcase.
By the way your car sounds SWEET !!!!!!
By the way your car sounds SWEET !!!!!!
It'a like a siphon on a gas tank.
pishta
I know I'm right....
once a siphon draws air, its action is done as it'll draw light air instead of lifting heavy fuel. BBD is a bottom feeder, inlet is low in the bowl so fuel could be drawn back into pump/tank. The pump should have 2-3 check valves in it depending on what model you have and you may in fact have a bad check valve, but I believe its heat related myself. My first 340 powered 65 had this issue. hard as hell to start hot and in the morning it took forever to start. installed a carter electric and it solved both problems. If I had a TQ, the bowls were leaking, if it was a AVS, the heat just boiled it right out. I just cant remember what carb I had on that car, IIRC it was an AVS as it still had 68 logs on it.
Charrlie_S
Well-Known Member
BBD has the fuel inlet at the top of the float bowl, not the bottom. It is above the fuel level. It can't siphon fuel from the float bowl. Try this: remove the top of the carb, while on the engine. Then just crank the engine to fill the float bowl. Then remove the fuel line from the inlet, and tell me how low the fuel gets in the float bowl.
pishta
I know I'm right....
Your right, my mistake. Looking at an exterior view it looks like the fuel inlet is low in the bowl but upon further examination, the inlet seems to be higher than the fuel level, but not my much. How far are the jets under the fuel level when its at its proper height? The wells look deep but the jet looks to sit high. Im thinking back and realize that all carbs are like this, top feeders as the design of a bottom feeder may put unnecessary faith in the needle seats to keep fuel in the bowl against gravity. I got the siphon part right, but a swing and a big miss on the bottom feeder statement. I never owned a BBD, only the H2.
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