| Big Red 51 | -- 05-16-2014 @ 1:29 PM |
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Thought I would relate this saga to maybe prevent others from having similar problems. When my old Airtex 9597 fuel pump gave up early last year on my '53 EAB engine and carb, I bought a new 9597 from a vendor. I installed it and immediately blew the power valve on the carb. I searched out a pressure gauge and found it was putting out 7 1/2 to 8 pounds. About 5 pounds too much for the old Model 94 carb. The replacement pump produced the same number. Talked with the Airtex assembly operation in Illinois and they said they don't check the pressure on the new pumps per a supervisor. So a regulator was installed and set at 2 1/2 lb.About 700 miles later the pressure was down to 5 1/2. More miles and now down to around 3lbs with the help of three additional gaskets. Now installation back to normal. I hope the pressure doesn't continue to fade in the near future. I can always remove some gaskets. Hope this helps someone. Don
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| oldford2 | -- 05-16-2014 @ 2:12 PM |
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Well, I hope some others will chime in but I do not understand how high fuel pressure could "blow" out a power valve. Maybe a backfire thru the carb? JMO John
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| trjford8 | -- 05-16-2014 @ 8:52 PM |
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It's possible that this "corn" gas took out the power valve? I wreaks havoc on rubber that is not alcohol proof.
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| Big Red 51 | -- 05-18-2014 @ 3:12 AM |
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It was a new PV which was ethenol resistant, Car Quest FM 742. All the carb pros on here say 2 1/2 lbs pressure works best for the 94 carb.
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| ken ct. | -- 05-18-2014 @ 8:09 AM |
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Don't know what #FM742 but ones I use are FM 728D rated at 5.5. from CARQUEST also. What is the rating for the 742 ? If you don't know your just buying blind. ken ct.
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| Big Red 51 | -- 05-18-2014 @ 5:30 PM |
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A typo Ken, is a 728D.
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