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Tuck started leaking gas onto the intake, saw it was coming from the front of the carb under the accelerator pump. The cap the holds the power valve in place. Figured it needed a new gasket so I pulled the carb off made a pretty new gasket and put it back together. Well about 30 seconds later my gasket material was beginning to get wet. This is gas proof carb gasket material. So upon looking further into it my power valve is leaking causing the cap to fill up with gas and leak.
google turned up no specific answers. Which power valve should I buy? My searches keep mixing random information for Holley carbs or motorcraft carbs on jeeps. Does it make any difference or are all 2150 carbs the same?
Engine is a 400 with Weiand intake and straight up timing. Truck is a 79 f250 used for trailer pulling and crap hauling.
First make sure that the leak is not from a warped cover. Make sure it's flat .
You can determine the power valve to purchase by hooking your vacuum gauge to an available vacuum port on your intake manifold usually found at a capped port on the vacuum tree behind your carb.
If the vehicle has a manual transmission, take the vacuum reading with the engine thoroughly warmed up and at idle. If the vehicle is equipped with an automatic transmission, take the vacuum reading
with the engine thoroughly warmed up and idling in gear. In either case, the power valve selected should be 1/2 the intake manifold vacuum reading taken. EXAMPLE: 13” Hg vacuum reading divided
by 2 = 6.5 power valve. If your reading divided by 2 lands on an even number you should select the next lowest power valve. EXAMPLE: 8” Hg vacuum reading divided by 2 = 4 power valve. Since there
is no #4 power valve you should use a 3.5.
These are the power vaves offered from Walker here ..
Thanks guys. I don’t think the walker product numbers are used anymore, oreillys seems to have record of them but none in stock. Does anyone know where I can get one without going through an obscure carb repair shop with weeks of shipping? Every picture seems the same. Is there any carry over from Holley to the motorcraft carbs? I’d be fine with a mildly incorrect vacuum setting at this point as long as it stopped leaking gas.
Here you go. Just click on the triangle to get the drop down box to open for the size you want. I've dealt with these guys before they're offer quality parts. BTW It would totally surprise me if you couldn't get any of Walker's offerings.
I would order a couple .
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