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Thread: Here is a tricky one.

  1. #1
    adder Guest

    Default Here is a tricky one.

    Hi all,

    Here's the deal.

    I have a 4781 that leaks under the front of the carb. If I run my fingers across the carb to manifold gasket, I get a stripe of gas across my fingertips. Not bad. When the car is hot it evaporates and it is dry. After the car cools, it is wet there for a day or two. (it is not he bowl, power valve or metering block gasket.)

    I do have gas washing down. Plugs are wet and after time (2 months) I notice gas in the oil.

    I have swapped out the bowl and metering block. No change. I have put in new gaskets, power vales, needle and seats, accelerator pumps, etc. The float levels and pump adjustments are correct.No change. I put my metering blocks and bowls on a parts main body I have (although it ran like crap) it was dry as a bone.

    I am assuming I have a cracked main body or the base-plate to body gasket is bad. It is weeping inside the carb, soaking the front of the intake manifold gasket and washing down the cylinders. I can't put my finger deep enough down the throat of the carb to feel where it's wet.

    I really like this carb. Even with this problem it performs great. It idles nice and it is very responsive. It doesn't lag, pop, stumble or anything. I can stab the gas peddle or run the rpms up slow. It runs flawlwssly. I do not want to get rid of it.

    This problem is only in the front of the carb.

    How can I check for a crack or a bad gasket in the main body?

    Thanks,
    Greg

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    22,906

    Default

    Have you tried replacing the main body gasket (throttle body gasket)?
    If you don't need a choke, you can buy Holley's main body replacement and attach all your hardware on it:
    http://www.holley.com/types/Gaskets.asp
    http://www.holley.com/types/Main%20Bodies.asp
    http://www.carcraft.com/howto/ccrp_0...ors/index.html
    http://www.thirdgen.org/techboard/ca...vs-holley.html
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
    adder Guest

    Default

    Thanks, that is what I will try next. No I do not run the choke on it.

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