Looks like im getting some fuel on my intake on the passender side. Stared as just a stain at first like last year, I think to be extected from the butterfly rod. But now it got worse, No pooling just the leftover gunk and can smell it now. I checked the float levels all good.
my 650 leaks a little hear and there too. I think its from lack of regular use. I know when Im running my car more than once in a great while it doesnt leak but when I only start it here and there it leaks and drips on my manifold. and since my manifold is powder coated burgundy its a big deal. it only leaks enough to drip here and there but any fuel leak is a bad thing. forgot to mention my carb is an edelbrock not holley
Ya i think a renew kit. just because we like working on the thing and looking good. Time to pressure wash under the hood any way, and like that aluminum intake look.
More likely the bowl gaskets need to be changed and/or upgraded to the newer style gaskets that don't shrink with age. I wouldn't pressure wash it. Use spray carb cleaner then follow up with a garden hose on the lowest flow setting and gently rinse the carb cleaner and gunk off the intake.
What?.. yet another Holley with leaky shafts? Say it isn't so. Also akes them a bithc to tune right when they really get bad. You can actually even start to hear the air crackling/popping with your ear near the front venturi's.
Yes, it is more likely. I've never had a throttle shaft leak fuel. And I've been running Holleys for nearly 40 years now. Seen many leak fuel from the old cork bowl and meter block gaskets
consider yourself lucky then because about 6 out of the 10 well used units that I see are either leaking enough to stain the manifold.. or at least enough to collect that oily looking dust at the beginning of a leak. Another thing I've noticed through they years.. and have learned the hard way myself as well.. is that many people don't know how to adjust them which puts uneccessary strain(sideloads) on the shaft as the linkage tries to pull beyond the carbs built in stop. Some are so bad that the linkage plate starts to tweak and bend as they think mashing the gas pedal even harder will make the car go faster. I've certainly been guilty of that myself too if I'm starting to lose the race. lol The repair kits are pretty cheap.. but the reaming tool may not be worth the investment if not doing enough carb work to justify it though. In that case it's usually cheaper to buy another baseplate in known good condition. Easy to check if you rotate the shafts along their path and sideload them to check for slop. Unfortunately.. the bulk of the wear is usually idle/right off idle where it hurts the tune the most.
If there's actually fuel leaking from the throttle shafts, he's got more serious problems than that. Can there be residue accumulating around the shaft ends ? Yes, but if there's fuel dripping there, that's a bigger issue than worn throttle shaft bushings. (actually the plate is worn, there are no bushings) And yes, I agree with you groberts about the incorrectly adjusted linkages, throttle springs that are too heavy will also wear the plates and shafts.
I had a Holley 600 (4160 style) develop a throttle shaft leak, and others have too. They are notorious for it. The O.P. stated that the leak was on the passenger side of the manifold. Holley fuel bowls are in the front and rear, not the sides. I stand by what I said.
Last I checked, the fuel bowls extend out beyond the centerline if the intake. Which is where there's also the fuel line fittings (on a dual feed Holley, as well as my 3x2's)plus the bowl sight plug (that could also be a source of leaks) Fuel can travel quite a distance before it drips too. It can leak from one spot and drip at another.
A 4160 is not a dual feed. I don't know of many 600cfm 4150 models. Obviously the throttle shaft/base-plate is not the only possible source of the leak, but is a high possibility and should definitely be checked.
