1956 Evinrude 30hp pump conversion help

Outboard Related Only
Bigtrains
Posts: 5
Joined: Wed Sep 06, 2017 7:58 am

1956 Evinrude 30hp pump conversion help

Postby Bigtrains » Wed Sep 06, 2017 9:31 pm

I'm brand new to this board and I hope someone can help. I acquired a 1956 30hp almost for free while picking up a Lark for my 1958 Lone Star runabout. I love the way the 56 looks. It has spark and is a bear to pull, so I've got high hopes that the compression #'s will be solid. I want to convert the motor to single fuel line. My question is which part number Briggs and Stratton or Mikuni pump will supply enough fuel? I can drill and tap the intake cover for a nipple. Thank you in advance!

davesko
Posts: 82
Joined: Thu Nov 10, 2016 9:48 am
Location: Hershey Pa

Re: 1956 Evinrude 30hp pump conversion help

Postby davesko » Wed Sep 06, 2017 11:22 pm

Welcome, I would seriously consider not doing a conversion. Get yourself a pressure tank and use it. That's a great motor, I have one myself and love it. Make sure you change the water pump and do a go through on the ignition and carb. I've never been one for conversions. I've heard some horror stories when they are done wrong. A pressure tank can be gotten reasonably. Good luck.Dave

Bigtrains
Posts: 5
Joined: Wed Sep 06, 2017 7:58 am

Re: 1956 Evinrude 30hp pump conversion help

Postby Bigtrains » Wed Sep 06, 2017 11:30 pm

I've given quite a bit of thought to the conversion. The boat is set up with single line and I've never seen a pressure tank in usable condition locally. By the time I find a tank, get it clean, renew the gaskets and o-rings, I could have purchased a few pumps. I work on very high pressure common rail fuel systems on locomotives. I'm confident that a conversion can be done and safe.

Chris_P
Posts: 2246
Joined: Tue Mar 10, 2015 4:59 pm
Location: Hamilton ON
Contact:

Re: 1956 Evinrude 30hp pump conversion help

Postby Chris_P » Thu Sep 07, 2017 6:09 am

The conversions are fairly easy on the Big Twins. Ive done alot of them. Also, easy to put back if you ever want to. You wont be doing any UN Reversible!

I have never tried a Briggs or Mikuni on the Big Twins. I have used them on the 10hp and down conversions though. I suppose as long as they have a high enough GPH rating, you should be fine. At least 3 GPH.

Bigtrains
Posts: 5
Joined: Wed Sep 06, 2017 7:58 am

Re: 1956 Evinrude 30hp pump conversion help

Postby Bigtrains » Thu Sep 07, 2017 7:10 am

I don't mind drilling/tapping the boss. My concern was which pump to use that will keep the bowl full. I plan on situating the fuel tank in the original spot which is next to the transom.

FrankR
Posts: 2778
Joined: Tue Mar 10, 2015 6:32 pm
Location: Florida

Re: 1956 Evinrude 30hp pump conversion help

Postby FrankR » Thu Sep 07, 2017 7:50 am

I have never personally used either one on a Big Twin. I am kind of surprised that the B&S pump works at all on a two-stroke, but evidently it does. A Sierra 18-7353 (OMC 438555, 433386) is made for use with a pulse hose.

I have a B&S that I'll give you for the postage. But not right now. Hurricane Irma is threatening to wipe us out. Send me a PM if we are still around.

crosbyman
Posts: 637
Joined: Tue Mar 10, 2015 11:39 pm
Location: Montreal Canada

Re: 1956 Evinrude 30hp pump conversion help

Postby crosbyman » Thu Sep 07, 2017 8:40 am

http://www.mikunioz.com/shop/df52-745-f ... 2439316-s/

dirt cheap some are just 15$ in the B&S name )(same pump)


good for 14Liters per h or.... 3gph
Attachments
5.5 Hp Dec 2013 019.jpg
mikuni ..B&S pump # 808656
5.5 Hp Dec 2013 019.jpg (970.59 KiB) Viewed 329 times

User avatar
Phil B
Posts: 450
Joined: Mon Mar 09, 2015 6:34 pm
Location: Massachusetts
Contact:

Re: 1956 Evinrude 30hp pump conversion help

Postby Phil B » Thu Sep 07, 2017 12:18 pm

Bigtrains wrote:... My concern was which pump to use that will keep the bowl full.


At least on the smaller engines, the bowl never stays full. I was expecting Frank to point this out. Are the big twins any different?
[the Aerocraft & OMC boat guy; formerly "Silver Bay"]

FrankR
Posts: 2778
Joined: Tue Mar 10, 2015 6:32 pm
Location: Florida

Re: 1956 Evinrude 30hp pump conversion help

Postby FrankR » Thu Sep 07, 2017 12:21 pm

Expectations met. Yep, don't expect the glass bowl to stay full. I thought he was referring to the carb float bowl.

Bigtrains
Posts: 5
Joined: Wed Sep 06, 2017 7:58 am

Re: 1956 Evinrude 30hp pump conversion help

Postby Bigtrains » Thu Sep 07, 2017 2:00 pm

I am referring to carb bowl. I don't care too much about the sediment bowl.


Return to “Ask A Member”

Who is online

Users browsing this forum: Bing [Bot], Chinewalker, westwind and 5 guests