Hi fellas. New member here. After reading all old posts and talking to all the "experts" I am at my wit's end.

I have a 750 cfm Holley vac secondary 4160 carb. It was a leaker from day one and has been gone thru twice by a well advertised carb expert on the West Coast and now Holley themselves have gone thru it and can't find anything wrong.

Problem is fuel pours out of bottom of carb with just the fuel pump on. Fuel levels are set correct (triple checked). Will get fuel pool on manifold on throttle linkage side. Can see some fuel on carb body just over the throttle shaft on secondary side. I have taken carb off engine with fuel bowls filled and fuel drips out of bottom of baseplate in so many places it is impossible to trace. I have actually drained 7 qts of fluid out of my oil pan of which only 5 qts was oil, the rest was gas!

Thought it might be fuel pressure but carb has leaked with gauge reading 3 PSI up to 6 PSI with engine not running!

Any help you could give this inexperienced carb tuner would be greatlly appreciated.

Since you've had an "expert" and Holley themselves look at it and still nothing, I would trash it and get a new one. Since you're getting so much wash down, it's not worth the chances you are taking. But that's just me and my .02...

It's gotta crack somewhere beyond the eye. trash it. You've already put to much time into this very commen item.

you might have the wrong gasket between the metering block and main body. There are two different styles with the diferrence between them being the area where the accelerator pump makes its transfer from metering block to main body just above the power valve. One gasket has just a hole, the other has a horseshoe cutout. If you require the gasket with the hole and use the one with the cutout, then there is no closed route for the fuel to pass and it ends up pouring out through the base plate.

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B Sinc

Had a black lab purebred dog once. Was registered and I paid a lot of money for him. I could never break him from tearing up EVERYTHING he could find (bit my garden hoses into 2" long pieces), dug EVERY plan in the yard totally out of the ground. Put up with him for about a year but finally got fed up and took him to the pound.

You got one of those. Take that bad dog to the pound and get a new puppy.

Hey Willys36 I must have gotten your lab's brother, S O B did the same thing, ate hoses like dog treats and the yard looked like a mortar target, The final straw was when he ate the leg off a hundred year old dining table then dug a two foot deep hole in front of the house entry steps, DOG GONE!

Did you get him from the pound? Sounds exactly like you got hold of my old dog!!!

Yeah, I hear what you guys are saying. Last time I got it back from the Carb Shop I said if it leaked I was going to take a sledge hammer to it and buy a Demon.

Could it be that my fuel pressure gage is bad? Brand new Earl's unit. If there was too much pressure would it build up in the bowls even after the pump was turned off causing it to leak?

I have a related question. Is it necessary to run a Holley "Blue" electric pump and matching regulator for a street driven car? Wouldn't a Holley "Red" pump be better for the street? Was given the Blue pump free (brand new in box) by a friend who decided to go to fuel injection and didn't need it.

It shouldn't make a big diffrence as long as both pumps were regulated at 7 PSI. If the pump were pushing off the needle and seat, then the floats would indeed fill up, and assuming no other leaks, the fuel would escape out the vent tubes. You would probably see it shoot out, sometimes as high as a few inches. The red pump is more suited to street use but I don't think that what the problem is.

My mother has a Chow that constantly barks at birds, at all hours of the night. How do you stop birds from flying over the house?. She will send him back.

so what did you end up doin

I've always had troubles with holleys leaking fuel like mad.

Just think about who makes them "Ford", ever see a ford truck with a few miles on it? Look under it and you'll see that both the front and main seals on the engine drip out oil

Get yourself a nice quadrajet or predator carb

EDIT: It does sound like the float is not set right.

Took it off the engine and put a beautiful Speed Demon 650 on. You would swear it is fuel injectied it is so responsive!

That would have been my suggestion,but you beat me to it,Ive always liked the performance of a Holley,when they worked,just could have done without the gremlins,yea the cars to,Berry Grant did it right

well i am about to get a holley 600cfm 1850 - 4 -1664 for $50 bucks. The thing will be goin on a 425 caddy engine i have in a beater 70 long bead chevy i have. The guys said that one of the accelerator valve gaskets is leaking, and that he is willing to fix it before he sales it. Does the pose a problem in the future.

Hey,if he garintees it to work,how can you go wrong for 50 bucks? Can you pay him after its running to be sure?