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In a message dated 7/15/2004 10:01:14 AM Eastern Standard Time, [EMAIL PROTECTED] writes:
See
http://www.aeroaccessories.com/fuelpumps/continentalappguide.html for a nice
table of which pump works for which engine.
I don't know whether this information is overly conservative or flat out incorrect, but after studying the Ercoupe TCDS's, the Engine TCDS's, parts catalogs, and consulting an astrologer, I have come to the conclusion that any pump listed for either the C75, C85, or C90-12, (but NOT the C90-16), can be used interchangably. The above link indicates the C75 and C90 use the same pump, but not the C85. The C85 uses the same case and camshaft as the C75 so there can't be a mechanical issue.
Ercoupe TCDS A-718 lists the AC 9051 as suitable for the C75. Aero Accessories lists it as suitable for the A65 and C85 but not the C75. For Ercoupes, at least, I'm inclined to go with the Ercoupe TCDS. TCDS A-787 lists 4 carbs for use with either the C75, C85 or C90-12 and 1 carb ONLY for the C90-16, AC 6861, also for the O200. This all makes sense because the C90-16 and the O200 both have vacuum pump drives on the cam and none of the others do.
(Note that Aero Accessories states that the C90-14 may use either the 9867 or 9076, but the only difference between it and the -12 is the engine mount. Go figure...)
QED (?)
Of the pumps that are readily available, the AC 9051, 9076, 9867 and 4036 are all suitable for installation on the C75, C85 and C90-12. The AC 6861 MUST be used on the C90-16 and O200 for mechanical reasons.
Fuel flow rate for all pumps is the same. (I have no specs for the AC 4036). Pressure for the 9076 is 5-7 PSI. All the others are 3.5-4.5 or 3.5 to 4.75 PSI. The stroke is 1.937" on the gang of four and 2.062" on the 6861.
And now you know... The Rest of the Story.
John
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