Has anyone else experienced this problem? I am using a beer keg for a gas tank and it sits higher than the fuel pump. Recently when the car sits I see gas collecting on the intake maifold. The car runs fine and doesn't have flooding problems. I was wondering if the mechanical fuel pump should hold the back the fuel. I have a manual fuel shut off in the line and the fuel doesn't collect when I shut the line. Any suggestions would be appreciated. The carb is a quadrajet and I have replaced the gasket between the carb and manifold.
If all the lines are tight and the floats valves seated it should not leak. Flare fittings at the carb are common leak points if there is any pressure in the line. Fuel sitting in the tank on a warm day will build some pressure so check the fittings at the carb...wipe around them with your finger to check for any weeping at the joint.
This may not be my area of expertise, but I wonder..... Hey! No snickering back there. I'm sure I must be an expert in something or other. Sure, I majored in power drinking in school, but I must have learned something.
But, I wonder if the carb has a soldered brass float which may leak and be partially submerged thereby not able to maintain sufficient seat pressure.
Mr. Bill brings up a good point regarding sun light heat building pressure in the system. Do you have a tank vent?
This may not be my area of expertise, but I wonder..... Hey! No snickering back there. I'm sure I must be an expert in something or other. Sure, I majored in power drinking in school, but I must have learned something.
But, I wonder if the carb has a soldered brass float which may leak and be partially submerged thereby not able to maintain sufficient seat pressure.
Mr. Bill brings up a good point regarding sun light heat building pressure in the system. Do you have a tank vent?
Has anyone else experienced this problem? I am using a beer keg for a gas tank and it sits higher than the fuel pump. Recently when the car sits I see gas collecting on the intake maifold. The car runs fine and doesn't have flooding problems. I was wondering if the mechanical fuel pump should hold the back the fuel. I have a manual fuel shut off in the line and the fuel doesn't collect when I shut the line. Any suggestions would be appreciated. The carb is a quadrajet and I have replaced the gasket between the carb and manifold.
The Q-jets have a bad problem with the welch plugs on the base of the carb leaking fuel. I doubt if the carbs flooding if it seems to be running fine.
The fix in the old days was some epoxy on the plugs.
Also check and see if its leaking at your fuel line and running back along the base of the carb, then dripping.
Another thing to check are all the screws holding the carb together are tight, both the base and the top cover screws....
I believe the base screws are accessed by taking the carb off, flipping it over....and they're on the bottom.
After some fine mechanical investigation, believe you can track it down....
Haha....since I couldn't edit my post, I'll also add this. Its probably a external fuel leak since your tank is vented....and where the bottom base screws are on the q-jet, that is also where the welch plugs that used to leak all the time.
If its got the big funky looking nut where the old origional fuel filter screwed to, and you have a nipple there, they had a tendency to leak there too.
Make sure also you don't have a leak in your fuel line....like a loose gas line clamp.
MAN, I haven't worked on a Q-jet since the old Sox-Martin Days!!!! Talk about a blast from the past! Guess thats what happens when we start getting old!!!!
I checked all the suggested places including the plugs which have been epoxied. Everything seems to be OK including the gasket at the fuel inlet. . I don't think it is a float seat issue as the engine does not flood when running. Is it possible that the mechanical fuel pump is the issue ?
Is gas collecting on top of the intake manifold OR in the bottom of the manifold????
If its on the outside, there is a external leak. If its inside the intake on the bottom of the intake floor....its a internal leak.
If you look in there and its just damp, after you turn the motor off. I'd say its OK, Cause when you open the carb to llok....your shooting raw fuel in there and the motor isn't running to use it.
However, if its external, you could add some dye and see where its leaking.....
Even if the pump is pumping too much pressure....you'd flood the carb, but shouldn't have any external leaks. Internal leaks yes, since you'd be pushing fuel past the the needle and seat, possibly filling the bowl all the way up, running fuel coming from your bowl vent and acc' pump shaft that comes thru your top cover.
If its just a little internally on the floor of the intake....I wouldn't worry. If its on the exterior....there is a cause for concern. Definite fire hazard!!! I spark from your plug wires and she could burn down!!!
There is a fuel dye you can put in your tank, run you motor a little. you should be able to see it. Theres also the kind that I use where you detect it with a black light...should show itself fairly quickly.
I would be extremely careful....with raw fuel on your motor, it wouldn't take much of a accident of have a roaring fire there. Be careful, and look everywhere....
iirc ,the q-jet has a check ball in the accelerator pump circuit. IF the carb is percolating when engine is shut off hot[pretty common for q-jet] and thier is a little excess play on primary throttle shaft, then fuel exits the accelerator pump nozzles,drips on the throttle plates, runs past the shaft. However ,only found this a couple times many moons ago. so, check out the check ball, and make you have the proper base gasket AND heat shield [metal] gasket for q-jet especially if you have open exhaust port in intake. someone else may be able to explain this better.
dave
Checked with the local parts house and they have the dye. I am going to pick some up over the weekend. The manifold is a elderbock and does not have the open exhaust port that a OEM manifold has. Would it still be necessary to use the heat shield gasket??? Thanks for all the replies.
Checked with the local parts house and they have the dye. I am going to pick some up over the weekend. The manifold is a elderbock and does not have the open exhaust port that a OEM manifold has. Would it still be necessary to use the heat shield gasket??? Thanks for all the replies.
If its the Edelbrock dualplane like the old C4B intake, you could run it, but it isn't necessary. That alum. intake as tall as it is and thick, will act like a heatsink, keeping the carb cooler than the old huge hunk of cast iron, with the big honkin hole that went, more or less, into the darn exhaust. That was chevys idea of a brain fart..... :roll:
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