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Old 07-06-2013, 02:58 PM
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To much fuel

Hello,
1950 Plymouth, straight 6 with 2 Holley 92's. Had idle problems and decided to rebuild carbs and replace the electronic aftermarket fuel pump. Car ran pretty good buy when the car died, the fuel kept pumping into the carb throats, filling them up about 1/4" of fuel. Turned ignition off and the fuel still kept flowing and totally flooded the engine. I re-adjusted the float height thinking the needle valve was not closing. No go, still flooding. New fuel pump has 5-8 psi rating, same as the one I replaced. Any ideas would be greatly appreciated.
Thanks!
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Old 07-06-2013, 03:38 PM
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Quote:
Originally Posted by Boacon999 View Post
Hello,
1950 Plymouth, straight 6 with 2 Holley 92's. Had idle problems and decided to rebuild carbs and replace the electronic aftermarket fuel pump. Car ran pretty good buy when the car died, the fuel kept pumping into the carb throats, filling them up about 1/4" of fuel. Turned ignition off and the fuel still kept flowing and totally flooded the engine. I re-adjusted the float height thinking the needle valve was not closing. No go, still flooding. New fuel pump has 5-8 psi rating, same as the one I replaced. Any ideas would be greatly appreciated.
Thanks!
You won't have any idea of what is really going on as far as pressure at the carburetors until you branch off at the carb inlet and run a line back, up past the hood lip and to the cowl to attach to a 0-15 fuel pressure gauge that you can temporarily mount on the cowl and read through the windshield as you drive. I would suspect that the carbs won't like much more than 3 or 4 psi. More pressure will not make more horsepower. What it will do is to overpower the needle and seat and allow the pump to blow raw fuel into the intake manifold, creating a tuning nightmare that you can live without..

Really nice lookin' little coupe, by the way.
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Old 07-06-2013, 07:37 PM
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Quote:
Originally Posted by techinspector1 View Post
... branch off at the carb inlet and run a line back, up past the hood lip and to the cowl to attach to a 0-15 fuel pressure gauge that you can temporarily mount on the cowl and read through the windshield as you drive.
Or use a racer's friend...duct tape it to the windshield
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Old 07-07-2013, 06:38 AM
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pls explain..

Quote:
Originally Posted by Boacon999 View Post
Hello,
1950 Plymouth, straight 6 with 2 Holley 92's. Had idle problems and decided to rebuild carbs and replace the electronic aftermarket fuel pump. Car ran pretty good buy when the car died, the fuel kept pumping into the carb throats, filling them up about 1/4" of fuel. Turned ignition off and the fuel still kept flowing and totally flooded the engine. I re-adjusted the float height thinking the needle valve was not closing. No go, still flooding. New fuel pump has 5-8 psi rating, same as the one I replaced. Any ideas would be greatly appreciated.
Thanks!
u said u turned off motor and fuel still keep flowing ??? is the fuel pump still running with ign sw off ???? if not i'm not understand how u can fill up an engine with no pump running.
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Old 07-07-2013, 09:36 AM
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I am running the stock fuel pump on my 230 flathead with dual Carter/Webber 2 bbl carbs. The stock pump puts out all the fuel needed and everything ran great right out of the box. Bolted everything on hooked up the fuel lines and spent about 3 minutes adjusting idle screws and was done. Been running it for about 5 years combined on the original 218 and 230.

NAPA has the stock glass bowl fuel pumps. The website shows the non-glass bowl, but when it gets to the store it will be the glass bowl version. At least that is the experience I and several members of the P15-D24 site have had.
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Old 07-07-2013, 12:50 PM
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Thank you for your help. I did not have this problem with my old electronic pump so I am going to revert back to it and see if I have to much pressure. If I do, I am going to try to get that pressure reading like suggested. If it is at the 8 psi level, I think I will revert back to the old mechanical pump now that I know I can get one from Napa.. I will keep you all posted but really appreciate the suggestions. Oh, yea, the ignition switch was on but the car died. After I turned the ignition off, the fuel kept dripping out of the nozzles that are inside the throat of the carbs.
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