BenH
Well-Known Member
Hello folks,
I know there are many threads that discuss things like this, I'd still like to voice my own experiences out loud and see what other's input is.
I am running a typical mechanical Carter pump feeding a Holley 750 with dual fuel feeds one each bowl, vac secondary not a double pumper. It is a mild build 440, new build, in a 65 Sat. The pump is not old, but not new to me, and I can't confirm it's accuracy or even it's rating since I don't see a part number (pretty sure there aren't multiple pressure types though for these?), it came on the 361 that was in the car originally, so I have a new one on the way for peace of mind that I will put on, M4845.
It is flooding pretty badly currently after just a few cranks, I doubt it's the fault of the pump, and I am almost certain when I take the carb apart I will find float setting and needle issues. It is a rebuilt carb with a fair amount of new parts including the front main bowl and I believe the float as well.
The thoughts still on my mind however are whether folks think it is really necessary to have an inline pressure regulator for Holleys? Holley's claim is any pressure in excess of 7.5 psi will cause flooding, and the Carter pump is rated 6-8 psi (certainly has to be a small margin of error there). I know this is nitpicking but I am just looking for opinions, the last engine I built was a 383 and I put a regulator and gauge on an identical setup and it was very happy.
Second question, anyone know what the measurements for setting correct baseline float height in a rebuild on a Holley are? It's flooding like I said and I'd like to start at a manageable point instead of trying to set the float height while it is puking gas, it just wont run like that and I don't want the excess washing down the cylinders and filling up the crankcase (been there done that).
Final question, the pump pushrods are the same from B to RB, yes?
I will update tomorrow when I pull the carb apart as well. Thanks in advance. The engine is otherwise ready to break in and this is the last thing in my way.
I know there are many threads that discuss things like this, I'd still like to voice my own experiences out loud and see what other's input is.
I am running a typical mechanical Carter pump feeding a Holley 750 with dual fuel feeds one each bowl, vac secondary not a double pumper. It is a mild build 440, new build, in a 65 Sat. The pump is not old, but not new to me, and I can't confirm it's accuracy or even it's rating since I don't see a part number (pretty sure there aren't multiple pressure types though for these?), it came on the 361 that was in the car originally, so I have a new one on the way for peace of mind that I will put on, M4845.
It is flooding pretty badly currently after just a few cranks, I doubt it's the fault of the pump, and I am almost certain when I take the carb apart I will find float setting and needle issues. It is a rebuilt carb with a fair amount of new parts including the front main bowl and I believe the float as well.
The thoughts still on my mind however are whether folks think it is really necessary to have an inline pressure regulator for Holleys? Holley's claim is any pressure in excess of 7.5 psi will cause flooding, and the Carter pump is rated 6-8 psi (certainly has to be a small margin of error there). I know this is nitpicking but I am just looking for opinions, the last engine I built was a 383 and I put a regulator and gauge on an identical setup and it was very happy.
Second question, anyone know what the measurements for setting correct baseline float height in a rebuild on a Holley are? It's flooding like I said and I'd like to start at a manageable point instead of trying to set the float height while it is puking gas, it just wont run like that and I don't want the excess washing down the cylinders and filling up the crankcase (been there done that).
Final question, the pump pushrods are the same from B to RB, yes?
I will update tomorrow when I pull the carb apart as well. Thanks in advance. The engine is otherwise ready to break in and this is the last thing in my way.