1957 AD-11 7.5 fuel line into carb

[JimVmd]

Hello,
I now find the clear plastic hose from the gas connector into the carburetor inlet is cracked. The hose is brittle and unusable, probably from age and ethanol. What are folks using? I currently have temporary fix with standard 3/16 ID automotive fuel hose, but fear the pinch point going through the bottom cowl. Is there something better others are using? Or is ethanol compliant hose available from OMC or aftermarket? This is a clear hose originally, the temporary hook-up I have rigged is standard black fuel hose.
Thanks for any advice,
JimVmd

 

[HighTrim]

Re: 1957 AD-11 7.5 fuel line into carb

Well, someone put the clear hose on, that is not original.

It is originally 5/32", which is what the dealer will sell you. However, as you know, 3/16" is much more common, and cheaper. That will be fine. If it makes you feel better, open the hole up some with a drill bit, but if you got it through it will be ok.

The only issue, is the original style clamp on the fuel connector may not fit properly, and you will have to use a different clamp or just use a zip tie.

 

[nwcove]

Re: 1957 AD-11 7.5 fuel line into carb

the automotive line should be ok, if its not old stock. but you can go to your omc dealer and buy line by the foot that will be ethanol resistant, and maybe a bit smaller on the od. it is a tight spot to get lines in there! what are you using for the dual line from the tank to the male connector?

edit: as Chris mentioned, you should get a few fuel line " cable" ties ( omc #320107)....regular cable ties are not the best choice.

 

[JimVmd]

Re: 1957 AD-11 7.5 fuel line into carb

Excellent return. All true and what I just ran into.
HighTrim has followed my ignition problems, all resolved. It run-starts on first/second pull. Leaking water at power base. It is either that gasket, or the bottom head freeze plug. I have the gasket, impeller, and carb kit with float. This week I will replace the impeller and replace the powerhead gasket. I will disassemble the carb and clean out. Almost there, but might need a lower head freeze plug (appears empty hole) but can tell for sure.
Was at low sixty compression on dry test, now with a few minutes running, I'm curious what I have. Currently the pressure tank has fresh premium, 24:1 oil and Seafoam.
Fan of this site, thanks.
JimVmd

 

[HighTrim]

Re: 1957 AD-11 7.5 fuel line into carb

Let us know how it goes!

 

[nwcove]

Re: 1957 AD-11 7.5 fuel line into carb

grab a shift lever o-ring! not a crucial part, but worth replacing when you have it apart, will save you looking at the lil dribble and wishing you would have replaced it. think its omc # 303191....but do confirm that number for your motor.

 

[JimVmd]

Re: 1957 AD-11 7.5 fuel line into carb

I would love to find correct cross reference from OMC marine o-rings to something industry standard. On o-rings it is all about id, od, diam, and material. Most of the vintage dealers by OMC part number bring you old new stock, not suitable for a o-ring made of rubber. Most O-rings have an average shelf life of 15 years, like buna-n. Oh my, doesn't some one cross OMC to new production by ID, OD, thickness and material type?
I hear you nwcove, but I am about o-ringed out with the P/n ebay or google than costs me $6 bucks delivered for a $0.40 o-ring.

 

[HighTrim]

Re: 1957 AD-11 7.5 fuel line into carb

Just measure the old one, or bring it to your local Bearing/Oil Seal Supplier to match.

You also have to remember, OMC was smart in a way. They made all their o rings, or most of them anyways, different from the norm. Very hard to duplicate some, such as the shift rod seal (o ring). Some you can get close enough to work though.

 

[F_R]

Re: 1957 AD-11 7.5 fuel line into carb

Get yourself a Sierra Marine catalog. Some places will give you a free one. There is a page that cross-references OEM o-ring numbers with Sierra numbers. Similar pages for seals, etc. But you have to use some common sense with it. The 303191 o-ring is Sierra 18-7413, size listed as .301 ID x .070 OD. Now here is where the common sense comes in. Generic O-rings are sold by nominal size, not measured size. Or, actually by "dash" numbers. Back to the 303191, the only generic size that makes any sense is 1/4" ID x 3/8" OD x 1/16" thick.

"Special" sizes excluded.

 

[nwcove]

Re: 1957 AD-11 7.5 fuel line into carb

jmo, but after pulling the powerhead, and replacing all the bits mentioned, id be a bit peeved at myself for not replacing all the normal wear parts, and watching the dribble run down the leg. and i do agree that a 50 cent part can end up costing ya, but....the proper oe part will last for many years.

 

[JimVmd]

Re: 1957 AD-11 7.5 fuel line into carb

I will say that all makes absolute commercial robbery sense. Sierra has the micrometer.
Also, will say I look forward to nwcove's sig phrase about the sitting in a boat all day.
I will get the subject o-ring soaked all week in white lithium before it goes back, assuming no visible damage. If more repair later, so be it. Can't do another $6 wait on an o-ring probably beyond it's real shelf life. Value of risk, nominal too.