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Re: 3500 Fuel Issue

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Author  [Modern View]

01-01-2013 19:54:44

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Another thought - what's involved in changing over to a Cav rotary pump? I've got a 201 short block that has a Cav pump on it. No filters or low pressure fuel lines and I think it's missing one of the injection lines, but the pump and gear are there. Does the gear cover backing plate have to be changed? I know the timing gear is different which would obviously involve pulling the front cover.
Course, I have no clue if that pump is any good either - it looks just as rusty, only saving grace would be it shouldn't have gotten and water inside.

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Ultradog MN

01-02-2013 17:04:56

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 Re: 3500 Fuel Issue in reply to jaluhn, 01-01-2013 19:54:44  
The CAV and Simms front block plates are different. Simms might use the same plate as a gasser. It's been a couple of years since I looked at those part numbers and for some reason NH parts diagrams have been down for a couple of days so I can't verify.
I don't know if the drive gear is the same. CAV uses one with 3 bolts and a roll pin to time it.
I've got a couple of those here if you find you need one. Would send it for the price of shipping if you need one.

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01-01-2013 20:33:22

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 Re: 3500 Fuel Issue in reply to jaluhn, 01-01-2013 19:54:44  
I'd have to research the parts book for sure... I doubt the plate would need to be changed. Likely just the gear and all lines back to the filter. Those are not a big deal if you've got the high pressure lines.
Be sure to pop the cover off the rotary and free the metering valve before you install it if you go that route. Fuelling will also be a touch hot for the 175 but that could be adjusted down either now or later...


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