kingoftooland
Active Member
ok so I just have had enough of this problem n I gotta solve this FAST I got a edlebrock 500 cfm carm and no matter whet I do it reaks of fuel after I turn it off what in the world is going on
Well not really I pump the gas 3 times n she lights right off and I got not even a 6 month old edelbrock performer 1403 carb I have not jetted it or anything just made a simple idle adjustment otherwise it’s just as it was right out of the boxId ask if you have to crank it alot when you refire it? You could be boiling it but you could also be dripping or dumping raw fuel into the intake. How is the carb vented? I have noticed todays gas also has a strong smell weather in a car, or sitting in a gas can in my shop, alot evaps off. As odd as it may sound 35 years ago gas had a good smell vs todays gas thats very oppressive.
You know I did not think it had 3 lines I know I had a leak at one time on the line that is going from the right frame rail for the fuel pump feed it rotted out under the little steel cover behind the upper control arm on the passenger side n yes I have the char coke canister removed and the line capped off now could it be a excess buildup of fuel vapors in the tank??I’m not convinced that it is all fuel from carburetor bowls. Could be the only source but I suspect there might be something else (maybe).
There are three metal lines coming from the fuel tank: 5/16”, 1/4” and 3/16”.
The 5/16” line goes to the fuel pump from frame rail.
The 1/4” line goes from fuel filter back to frame rail (excess fuel return to tank)
The 3/16” line goes more forward and to the charcoal canister (fuel tank vapor feed).
All three metal lines have a rubber hose connection underneath car close to the firewall (as shown below).
From there, all three lines go to the fuel tank.
That is nine possible leaks from the rubber hose sections. Before the engine, there are six different metal fuel lines that might have suffered physical damage and/or rust through.
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This is from a '84 Gran Fury 318. The second picture shows the hoses by the firewall under car. I saved these so I could make duplicate lines for my cars, out of stainless (just another project I've yet to tackle).
The fuel filler neck grommet (to tank) is another common leak. Dodge part number 4002010 – which is still available. The MSRP is $18.10 (US) though (as of today).
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This how crackled the grommet is on my wagon. I’ve seen a couple at the pull-a-part that are “almost gone”.
What I would do is take some clean pieces of cardboard and place underneath car on the passenger side of car from fuel tank to fuel pump, after a turn off. Avoid getting cardboard close the catalytic converter, though. The fuel will evaporate but will leave a stain on the clean cardboard. If nothing, then see if you can do the same on an incline engine pointing up one night and down the next. If you have a non-carburetor/fuel pump leak it will show up in one of the three methods indicated. If you can get under car – there should not be any cracking of either of the nine (frame) sections of fuel hose.
Also, the Charcoal canister has three (of four) hoses going to it. The 3/16” hose from tank, a large and small hose from carburetor (which one or both might be disconnected) with the different carburetor installed.
The big carburetor hose comes from carburetor top and is used to capture fuel vapors that come from it (mostly at engine turnoff). If this one is not used (might not have a provision on existing carburetor) you will need to cap this off at the charcoal canister. The small vacuum hose pulls a small vacuum to the charcoal canister which sucks those fuel vapors down to be burned off. Some systems use manifold vacuum (base of carburetor) and some use venturi vacuum. Some use a fourth hose as a turn on/off valve (for 4-port charcoal canisters).
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This is an A-body TQ. The blue circle shows the large hose for vapor collection.
Another possibility might be if the charcoal canister is not getting any vacuum it might be saturated with fuel vapors – for charcoal can only hold so much.
In my opinion, the charcoal system is not worth the effort removing (more beneficial than not) – but it can be removed from car (in non-emission states, only). If you do remove it, it might be best for find an older car (Mopar or not) fuel tank vent system and place in rear of car. Fuel vapors running loose in the engine compartment doesn’t end well, in the long run.
BudW