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Checking for fuel leaks Empty Checking for fuel leaks

Post  ebeneezer on Tue May 07, 2013 2:43 pm

I know its been covered before. but could someone tell me again please. I'm not sure of the best way to check the interface between the crankcase and fuel tank. I think I might be loosing fuel.

Cheers Flying
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Checking for fuel leaks Empty Re: Checking for fuel leaks

Post  Ken Cook on Tue May 07, 2013 3:31 pm

Typically when I check a integral tanked Cox engine for leaks, I close the needle all the way down. If you have the two vent backplate, this is easier than the single with the tiny vent air hole. Place your finger over one of the vents while using a syringe to pump air into the other vent. Small drops of oil on the backplate screws and also around the perimeter of the tank will quickly reveal air bubbles. In addition, listen and lend your ear to the rear venturi intake. If you hear air leaking directly out of the rear of the screen the o-ring is leaking. The syringe plunger is pushed down as if your trying to blow the engine up. The syringe shouldn't leak down at all. Most of the time, fuel is leaking from the screws themselves. In that case, my only recommendation is to replace them as this typically seals them back up. Bernie provides better stainless screws than the plated screws that came stock. I haven't found a sealer that really works well for the leaking screws and I have found many plastic and also metal tank backs that have had casting flaws and cracks. Ken
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Checking for fuel leaks Empty Re: Checking for fuel leaks

Post  pkrankow on Tue May 07, 2013 4:39 pm

If this is the cast case on a metal tank then unless you are using a custom gasket you will have a problem. If the tank is leaking into the case it might fool you. Pressure test in BDC with the exhaust ports full open.

Phil
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