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Post by hammerdown on Nov 23, 2019 10:36:01 GMT -5
I have a fox body road race car with a 347. It has a 750 proform carb. It will stall on very heavy prolonged braking. The longer the worse it is. I installed a vented “crossover” tube that connects the two vents. This did not solve the problem. I’ve been told this is a flooding issue but I’m not sure how to correct the problem. The engine idles and accelerates great. It also dies when doing u-turns or hairpin turns.
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Post by Admin on Nov 23, 2019 10:51:23 GMT -5
Good first step trying the crossover tube to attempt to eliminate any potential spill-over... but fuel will still come out of the boosters if the float levels are too high. I would check/set float levels. Being a Proform carburetor, with unknown "emulsion", there are probably other metering block issues that should be addressed to make it work better all around...
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Post by hammerdown on Nov 23, 2019 11:04:22 GMT -5
So. I should lower the float level? Can this be done without disassembling the carb?
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Post by Admin on Nov 23, 2019 11:13:15 GMT -5
Absolutely, specifically, because it's a stalling issue when braking, I would suspect that lowering the secondary float level will help. See, the problem today is... back when, with 4150 (primary and secondary metering blocks) vacuum secondary and early double pumpers, the secondary metering block had booster feed channels that only angled horizontally... they were connected very simply higher up into the main wells, for the specific reason as to not spill over fuel out of the secondary boosters upon braking... today, in totally brain-dead fashion, metering blocks on the primary and the secondary are identical, with horizontally AND vertically angled booster feed passages...
Preferably with the car running, and the sight plugs removed from the sides of the float bowls... loosen the set screw on top of the float bowl, and turn the adjusting nut down, clockwise, a few turns. Does your carburetor have the glass side sight holes?... If not, simply remove the side sight plugs and adjust fuel levels so that they are at the very bottom of the holes that the sight plugs were removed from...
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Post by hammerdown on Nov 23, 2019 11:19:12 GMT -5
Yes. It has the site windows.
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Post by Admin on Nov 23, 2019 11:29:49 GMT -5
Okay, then examine where the fuel level is when it's running idling. I believe those are supposed to be in the middle of the sight glass windows, where there's a line... make sure they are both at the line in the middle of the sight glasses, and if there's still issue upon braking, lower the secondary some (like part turns of the nut, a flat or two at a time) until there is no longer a braking/stalling issue...
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Post by hammerdown on Nov 23, 2019 14:21:26 GMT -5
Thanks for the help.!!
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