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Ralph. I investigated the issue ones and found that the difference in these pumps are in the spring used inside, creating a different pressure when pumping. The C90 is running slower than the C85 but is using more gas at the same time. This is compensated by a higher pressure produced by the pump. Same is true for the C75 - running slower , need more volume pumped. But in a Coupe this is all just theoretical mumble , since the outlet on the pump is restricted anyway. The type certificate lists for a C90-16F engine the continental pump P/N/ 631391, or AC Pump P/N 5656861 only. I don't see why there would be a difference between a pump for a C90-12 and a C90-16, but it may be that this pump is having a different arm as some report. The Tc lists all other pumps as eligible for all other engines. So what is different about a C90-16F. I always thought it's the engine mount and nothing else... Someone enlighten me. Hartmut N3330H ----- Original Message ----- From: "R M Finch" <[EMAIL PROTECTED]> To: "'Ercoupe Technical Discussion (moderated)'" <[email protected]> Sent: Tuesday, February 17, 2004 8:35 PM Subject: [COUPERS-TECH] Fuel pump replacement ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Alon Aircoupe with Continental C-90-16F engine. The fuel pump quit, evidenced by the header tank fuel gage dropping even though there was fuel in the wing tanks. So with a mechanic's help I got an overhauled fuel pump, Aero Accessories Part Number 9051, from Sacramento Sky Ranch, installed and it seems to work fine. However, the mechanic called and said we need to check that it is indeed the correct fuel pump. At their web site http://www.aeroaccessories.com/fuelpumps/continentalappguide.html it clearly says that the proper fuel pump for my engine is P/N 6861 for the rebuilt. What's the difference? The PSI rating seems to be the same. I'm going to call them tomorrow to see what they say, but in the meantime wanted to check the EOC wisdom. Ralph ========================================================================== == == To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/ ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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