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West Wight Potter Mailing List maintainer
dfarrell@ridgecrest.ca.us
List hosted by www.tscnet.com
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Better check back with 2 cycle outboard operation manuals..
You can check all internal tank motors under 4 hp and some at 5 you will find
no fuel pump. they are all gravity fed. I tried for a while to install a
fuel pump on my nissan 3.5 with internal tank. They used to have a provision
for fuel pump. Not since 1997.
I was unable to get a dealer or mech to install a fuel pump because they had
no access to crankshaft. Nissan no longer supplied the option.
By the way on all 2 cycle outboards the crankshaft is alternatively pressured
and vacuumed (scavenged). Only automotive type (4 cycle) have pressurised
cranks.
Best
SF
In a message dated 3/21/00 6:44:50 AM Pacific Standard Time, etj@nwlink.com
writes:
<< Subj: RE: THE BRITISH SEAGULL ? - external fuel tanks require fuel
pumps
Date: 3/21/00 6:44:50 AM Pacific Standard Time
From: etj@nwlink.com (Eric Johnson)
To: wwpotter@tscnet.com
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West Wight Potter Mailing List maintainer
dfarrell@ridgecrest.ca.us
List hosted by www.tscnet.com
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> Adding an external tank to a motor with a gravity fed internal
> tank requires
> installation of a fuel pump. Outboard motors require vacuum from
> crankshaft
> to run fuel pump. None of the internal tank equipped motors allow
> installation of a fuel pump anymore. You would have to hold the
> external fuel
> tank above the motor all the time, Kinda painfull after a while...
You sure about that? Two problems with this theory: 1: Crankshafts are
usually under pressure, not vaccuum, and 2: I've not noticed a fuel pump in
any of my small outboards, but maybe I've not paid enough attention.
I thought the small ones just fed fuel directly by the vacuum created by the
venturi in the carburetor.
>>
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