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#2
09-07-2019, 07:48 AM
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Thanks for the replies
Fuel Good - Filters Good - Pump Good, no junk in carb screen, vent good. I am now suspecting coil / dizzy and will be checking that today. I don't believe I am running a 3ohm coil. It is a flamethrower, but it was one I had kicking around from my 6-cyl mustang.
Of course it's impossible to run down to a store and find a pertronix 3ohm coil... 
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#3
09-07-2019, 04:42 PM
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I was wrong above. FUEL PUMP BAD. Ran on a electric carter pump I had laying around. Perhaps this weak pump is why I was not seeing fuel transfer from idle to the venturis. MUCH better.
Sheesh. ALSO - Cleaned and lubed dizzy counter weights - that was an issue as well. Still need to get a 3ohm coil. Last edited by 1966Mustang; 09-07-2019 at 04:46 PM. Reason: correction
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#4
09-07-2019, 06:48 PM
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Glad you pinpointed it!
__________________
1987 V20 Center Console - Resto in progress
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#5
09-09-2019, 06:23 PM
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Took old fuel pump apart - top diaphragm cracked, bottom diaphragm not much better looking.
Sierra 18-35437 Fuel Pump is not the right replacement for this engine. Not sure if it purports to be, but the cross reference I found listed it as one... not. Wrong cam lever for one... Wrong port orientation for 2. My engine is A678730 - Listing Fuel Pump: 8M0073435 which is proper. This looks correct: https://boats.net/product/mercury/8M0073435
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#6
09-09-2019, 09:45 PM
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I got the same motor, was thinking fuel pump too. Glad you figured it out. Check Ebasicpower, I've bought a lot of parts from them. They will get them to you quick!
__________________
 77 V20 cuddy with 170 I/O Mercruiser 72 16ft. Carolina w/a 25hp Evinrude
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#7
09-09-2019, 11:06 PM
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Getting back to my fuel pump... AMK Products makes a complete carter rebuild kit that looks like the correct dimensions, but with an extra check valve for the mercruiser application. I've ordered a new OEM one, but I'm going to get one of these kits and try it on my old one.
https://www.deadnutson.com/carter-hi...p-rebuild-kit/ << the comments here talk about mercruisers... Great instructions -> https://www.428cobrajet.org/how-to-fuel-pump https://www.cjponyparts.com/67-and-u...-1967/p/AFP67/
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#8
09-11-2019, 11:36 PM
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The AMK Kit Works - AFP-67 - Rebuilding the OEM part is a possibility. Everything fits, proper dimensions.
Last edited by 1966Mustang; 09-11-2019 at 11:43 PM.
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Scott, Portland, OR '85 V-20 I/O, Merc 170
Hybrid Mode
