The 600 on my car was trouble free up till a few days ago when i ran a new metal fuel from the regulator to the frame (because there was to much rubber line i thought). Well at the same time i noticed thet the gl*** fuel filter was turned around backwards so i fixed that as well and i put the filter between the regulator and the carb because it seemed to route better under the hood this way .The next day i was driving in 100 plus weather and it started to flood so i pulled over and noticed that fuel was dripping out in to the secondaries and on the intake,so i figured that trash had got in to the needle and seat ***embly .I pulled the bowles off and cleaned them and the needle and seats real good with carb cleaner and it seemed better.Next day same **** ,so i pulled the bowls again cleaned it and lowered the floats a bit.Next day same ****.The only thing i can figure now is the regulator is set too high and overpowering the needle and seats,but it will continue to drip gas with the fuel pump turned off.The carb is real clean inside and out and looks pretty new.Any ideas ?
First get rid of that cheap gl*** filter. they're pretty, but dont filter out anything. Set your regulator to 3 or 4 pounds pressure if its a chevy, if its a Ford I usually set to about 7 lbs. General rules of thumb If its dripping down from the squirters stuck needle and seat, gas out the vent tube, float level, Never know carb just might need to be rebuilt!
I agree with Meteor, get an AC inline filter, those gl*** things ****! I also like to put the filter before the fuel pump to protect it too. A rule of thumb; if it screws up after you work on it, it's most likely something you just did. I learned that the hard way. Probably not a fuel pressure problem.
Also, check your float - be sure it hasn't absorbed gas. If it's br***, remove it & shake it next to your ear. If it's the black plastic one, check to be sure it's not cracked or chipped (and replace with br***).
you said you turned the filter around. a dirty filter? there's your most likely problem. all the previous crud the filter caught is now free to enter the carb! how does the carb know what kind of engine it's on? the main issue with fuel pressure is not pushing fuel past the needle and seat, never heard of ford needle and seats vs. chevy needle and seats in a holley carb.
A square bowl Holley should not have more than 4 lbs of fuel pressure. I'm ***uming your carb is a #1850 600cfm with a single inlet and square bowls.
You are all right .I just drove it to the gas station and back and it didnt do the flooding thing.I did clean the fuel filter before i turned it around and i also cleaned out the new fuel line with carb cleaner before i installed it .Not sure on the fuel pressure though.The regulater has a Mallory sticker on it .I guess to adjust it you break the lock not loose and turn the allen clockwise to lesson the pressure? If it is just barely to much i would guess about a 1/4 turn?It seems to do the flooding thing when it is hotter than hell out side.
replace the filter. "cleaning" it won't do the trick. dirt is embedded in the filter element and will probably continue to be a problem. if you have a pressure regulator, you should have a pressure gauge too! i think you have it backwards(it's been years since i messed with the mallory reg i have) i think clockwise increases pressure.
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