I have a Holley R-3811 reproduction carb on a 67 427/390. I did a gasket replacement rebuild and I couldn't get it started(flooding). I then had a shop (very experienced, good reputation) rebuild it. The car seems to start and run fine the first time after a rebuild (2 so far), but once the engine is shut off, it won't start again. There seems to be a massive amount of flooding going on. Does anyone have any unusual ideas for what could cause it to behave like this? I'm sure the shop has checked the usual things.
Holley carb help!
Collapse
X
-
Re: Holley carb help!
I have a Holley R-3811 reproduction carb on a 67 427/390. I did a gasket replacement rebuild and I couldn't get it started(flooding). I then had a shop (very experienced, good reputation) rebuild it. The car seems to start and run fine the first time after a rebuild (2 so far), but once the engine is shut off, it won't start again. There seems to be a massive amount of flooding going on. Does anyone have any unusual ideas for what could cause it to behave like this? I'm sure the shop has checked the usual things.- Top
-
Re: Holley carb help!
Robert,
If the carb starts flooding when turned off the floats are set to high or the seats are NG. Replace seats and reset floats should fix your problem.
Sounds like the rebuild performed was less than what's required. Todays gas seems to give a shorter life to the viton seats.- Top
Comment
-
Re: Holley carb help!
Thanks guys,
The guy at the shop went so far as to weigh the floats, so I think he was pretty careful about the rebuild. However, it's back to the shop tomorrow and I'll mention a possible warped metering plate and the float levels. I've had the carb for over 20 years and never ran into this kind of trouble before. After tearing it apart today I noticed there was no pump discharge check ball and don't know whether one is needed, but I will ask him about that too.- Top
Comment
-
Re: Holley carb help!
Robert, There should be a discharge check ball under the squirters, this keeps the accelerator pump from sucking air when filling. These carburetors are very prone to leak if surfaces are not flat.
If the 390 has a cast manifold do you have a stainless plate under the carburetor, should be manifold, gasket then shield and carburetor.
I feel your pain as I went through this with my 3810 but now it seems pretty normal with regard to tuning etc. Check archives because there are many 4160 carburetor posts.- Top
Comment
-
Re: Holley carb help!
Gene, the check ball is under what is called the 'primary discharge nozzle' I believe. Unfortunately the diagram appears to be for more than one model so I can't tell if mine is supposed to have one.
Timothy, I may have the gaskets in the wrong order- I think I have the stainless one first followed by the gasket. I'll check that. Thanks.- Top
Comment
-
Re: Holley carb help!
Robert, There should be a discharge check ball under the squirters, this keeps the accelerator pump from sucking air when filling. These carburetors are very prone to leak if surfaces are not flat.
If the 390 has a cast manifold do you have a stainless plate under the carburetor, should be manifold, gasket then shield and carburetor.
I feel your pain as I went through this with my 3810 but now it seems pretty normal with regard to tuning etc. Check archives because there are many 4160 carburetor posts.- Top
Comment
-
Re: Holley carb help!
the check valve under the pump discharge nozzle is to keep the pump passage full of fuel. if there is no check valve the fuel would empty back into the pump area. acts like putting your finger over the top of a soda straw full of liquid and if you remove your finger the straw will empty out- Top
Comment
-
Re: Holley carb help!
Robert, The squirter has nothing to do with the fuel inlet at the seats and floats. The problem with the carb is loosing fuel after it is turned off. The float is set way to high and/or the seat (viton) is shot. The fuel today destroys that rubber seat in short order. The squirter has little to nothing to do with the leakage problem he is having.- Top
Comment
-
Re: Holley carb help!
Robert, The squirter has nothing to do with the fuel inlet at the seats and floats. The problem with the carb is loosing fuel after it is turned off. The float is set way to high and/or the seat (viton) is shot. The fuel today destroys that rubber seat in short order. The squirter has little to nothing to do with the leakage problem he is having.- Top
Comment
-
Re: Holley carb help!
Robert
Holley's are the easiest carbs in the world to set the floats on; I recommend you give it a go, it can be done with a screwdriver and cresent wrench.
Take those little view screws out on the side of the bowl and see if gas runs out while running or just after shut off; then you will know.
- Top
Comment
-
Re: Holley carb help!
Are you sure there is nothing hanging up the float(s)? I have seen it happen a lot, specially with today's gas, where the fuel hose to the carb is not replaced when the carb is rebuilt. These hoses are the item that gets attacked by today's gas and taking them on and off a few times tears away chunks and bits from the hose inside which then hangs up in the needle/seat.
Just a thought.
Stu Fox- Top
Comment
-
- Top
Comment
Comment