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Leaking Carb |
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PolarBear
AMC Apprentice Joined: Oct/16/2016 Location: Oregon Status: Offline Points: 59 |
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Posted: Mar/31/2018 at 8:51pm |
1962 rambler wagon, 196.5 Cast Iron engine. Replaced carb last fall. Was working good, now gas leaking out the overflow which was my problem before.
Wondering if the Electric Fuel pump is putting to much pressure and causing gas to push past the needle seat. Worrisome to have gas dropping on the hot engine afraid going to end up with fire. Anyone have information on this issue?? Should I go back to manual fuel pump? Get a new electric pump? Is there an alternative carburetor or fuel injection system that can be added. |
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Polarbear
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9042 |
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In my opinion there is no reason to install an electric fuel pump, in an old car with an otherwise stock engine. Since you do have an electric pump, I suggest you install a fuel pressure regulator and keep the fuel pressure down to around 3 to 4 psi. I have a 62 Classic now and had another 62 Classic wagon in the past and they they both ran great, but I did have each of the fuel pumps (mechanical pumps) rebuilt as a part of reactivating the cars after a long nap. Joe
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Happiness is making something out of nothing.
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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Needle and seat or a heavy float.....would be my thinking
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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what pump you have? i agree on the mechanical vs. electric pump, the old mechaicals are fine but they need to be rebuilt usually. it'll cost ya $100 one way or another.
carbs want NO MORE than 3 or 4 psi. and cheap regulators don't work very well; when there is no flow they can to the source-pump pressure, they regulate OK when fuel is flowing but not when it isnt -- eg. at turn-off, turn-on, on but not running, or possibly at idle. a perfect needle and seat might stop the 7 psi that's common for many electric pumps, but a non-brand-new seat that's otherwise totally fine might not. of course it could be that your carb has some issue (dirt, etc) in the needle and seat, or other issue in the bowl but if you have a non-stock pump setup i'd be suspicious. there is a good Carter pump, about $40, common as dirt and available on AMazon etc, that puts out a safe 3 psi. recommended for Weber carbs which do not tolerate high (7+ psi) pressures. most electric pumps are PUSHERS not PULLERS, like mech pumps are. they dont prime well by sucking and often die early in a pull mode. they're best off back by the tank, gravity fed to prime them. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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Kenosha62
AMC Apprentice Joined: Jan/24/2009 Location: Sacramento Status: Offline Points: 104 |
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Just a quick cautionary tale.
I had a buddy back in the 70's had a real nice land rover wagon. he put an electric fuel pump in and had a "minor leak" @ the carb, was going to install a cut off switch soon....yea right. Before that switch got installed......that "minor" leak burned the rover to the ground with the fuel pump happily gushing away. Of course he hooked up to constant power rather than switched power. Bring out the mallows and hershey bars , it's S'mores time I have a 62 wagon with the dual Holley set up. I have an electric pump wired in with an "impact" switch from a '97 town car mounter in the spare tire compartment with the fuse box. (new wire harness) https://www.hotrodhotline.com/kwik-wire-2nd-generation-14-circuit-harness#.WsJ_x2csDLg) there are a few different ways to go but this seemed the cleanest for my car. Oh yea and definitely check the pressure, mines at 5, I set it by a gauge and it's been perfect since. |
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vintage60
AMC Apprentice Joined: Aug/21/2017 Location: CT Status: Offline Points: 51 |
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First thing I would check is to make sure you didn't pick up any rust or other debris from the gas tank. Once in the carb it can keep the needle from seating and clog the jets. Open the carb and make sure the bowl is clean and no residue on the bottom. Make sure you have an inline fuel filter too but ultimately if you do find anything in the carburetor you'll have to address it at the tank because the filter will eventually clog. Second thing is to make sure the float is adjusted to the correct height and that it still floats properly. I also agree on the above comments regarding a regulator.
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