Hey guys,
so I got my new holley carb put on today
all went well, installed, tuned, did the timing
then realize the fuel pressure was too high
put on a cheap fuel regulator, set it at 3 1/2 cuz it kept stalling at 4
it's been driving okay for the past few hours

if the same problem arises, what should i look for?


on a lighter note, the carb brought my '74 350 back to life

 

Did you remove the sight plugs to see that the float bowl levels weren't set too high to begin with?

 

i have the holley carb,
where you cant adjust the float from the outside

 

Then do you have the model 4165/4175, Quadrajet replacement?
I change my question slightly...Did you remove the float bowls to see that the float levels weren't set too high to begin with?

 

600 cfm #80457-S
naw i didnt check the floats,
but i bought it from tw performance parts, they run the carb for an hour before they sell it, http://www.twperformanceparts.com/product/80457-S

glad to say the carbs running good now
i set the fuel regulator to 3 1/2

 

You might want to keep a watchful eye on it for a while. The recommended fuel pressure for your carb is between 5-7 psi. If it's overflowing at only 4 psi, then I would be concerned about the integrity of the needle/seat or a possible bad float. Or, you could have a small piece of crud stuck to a needle. It sounds like it's practically teetering right on the edge of floodation (made up word, but it works).

 

alright guys,
stalled three times on my way to work
a three mile drive
severe surging
couldnt go faster than 20 mph
what the???

maybe another bad fuel regulator?

 

Or not enough fuel pressure (see my post above), and the fuel supply can't keep up with demand. If that's the case, the surging/stalling would be from the engine running until it empties the bowls, stalling out momentarily, then running again after fuel gets back into the bowls, doing that over and over again. Your fuel pressure is set too low. If the carb is leaking/overflowing with the pressure set to where it's supposed to be (5-7 psi), then something is wrong with the carb. What kind of regulator do you have, and do you have an inline pressure gauge?

 

no inline pressure gauge, but i have a cheap $30 fuel regulator, that shows 3-7, in half increments.
tomorrow i have class then i have to drive my father to and from surgery.. guess ill be using someone else's car.. ahhh

i work with a guy thats pretty smart when it comes to old carburetor engines, hes said the surging is most likely from the fuel delivery, and i should by a more expensive fuel regulator, or even buy a cheaper fuel pump that wont pump as much pressure

 

You're using a mechanical pump, I presume? What brand is it? A lot of them are rated at 6 psi, others are in the 8 psi range. If you have one where the psi output falls within the range of the carbs recommendations, you don't need to have a regulator.