Merc 300 Fuel Lines

[timmeraw]

I am restoring a '60 Merc 300 that sat in a barn for 10 years. After many many hours of trials and tribulations with first the starting and then the impeller and then the control box/shifter etc...I finally took it out for its maiden new voyage today(on my classic '66 Whaler I am also restoring) and it ran like a champ.

Tonight I was cleaning it up preparing to finish up some new painting etc and(as I suspected should be the next refurb) I broke apart one of the old rotted fuel lines. It isn't the two that go two and from the fuel pump but rather another that comes out of the head below the fuel pump and goes into the pan I think( I am thinking maybe it is a line that drains unspent fuel into the exhaust or something). I wanted to take a pic but the camera batteries died.

Can someone please confirm what this 3rd line is and if possible please give me some part numbers(or good description) of it and the two other rubber fuel lines so that I can order them ASAP. I am leaving on the weekend for a vacation to Canada for some boating and fishing and I would like to cover some more bases before I leave.

Next step will be to de-carb the engine( I have sea foam for that) this weekend.

Any other preventative measures I should account for before I get to the back country with little or no parts supplies?

Thanks in advance for your assistance.

Tim

 

[Fuzzytbay]

Re: Merc 300 Fuel Lines

Check out this site, should give you the part numbers you need.
http://www.dougrussell.com/partscat...eaction=serials&colid=01&coldesc=800 (6 CYL.)

 

[timmeraw]

Re: Merc 300 Fuel Lines

Thanks Fuzzy,


Holy crap....nearly $40 for a 8" piece of hose for a single fuel line? That sounds crazy. In any case...what exactly is the 3rd line I broke that runs below the fuel pump into the bottom of the head or into the pan/exhaust or somewhere?

At that price for fuel lines maybe I'll hold off for now
Thanks for the site though.. a good resource for my old
girl.

Tim

 

[coolguy147]

Re: Merc 300 Fuel Lines

get some barb fitting in there and get your own fuel line

 

[timmeraw]

Re: Merc 300 Fuel Lines

Ok here is a picture of what I am talking about. What is this line for and is it something that needs to be replaced right now or is it a run off of unspent fuel or something that can wait for a bit? Also...see the fuel lines(what little you can)..how do they look? And....see the brown runny goo that seems to be all over the power head and laying in the bottom of the pan and even some on the cowl insulation....I was worried that it was a melting stator but someone told me that it was probably extra sealant or something like they used for the head gasket and not to worry....thoughts?

 

[backyard mechanic]

Re: Merc 300 Fuel Lines

I'd be willing to bet the gooey brown stuff smells like varnish. Hmmmm maybe cause it is. As far as the $40 dollar hose assy... buy a chunk of 1/4" (oil impervious) hose from NAPA and stick it on there with a new clamp. Bleeder hoses are not absolutely necessary but leaky ones will contribute to poor running. These old models are tough old birds.... they go and go and go and go.............. like an ever ready bunny.

 

[corm]

Re: Merc 300 Fuel Lines

Hi,

That's a oil recirculating hose. Replace it, you need it working.
Any fuel hose of the same dia will work.

 

[Fuzzytbay]

Re: Merc 300 Fuel Lines

Tim......lol yep pretty pricey item. I'd go with fuel rated hose, as suggested, and yes it should be replaced before you run the motor again. I am not sure what the line is, but I don't think the old inlines have "oil return lines", looks more like its for fuel return from the lower crankcase.

 

[coolguy147]

Re: Merc 300 Fuel Lines

ya replace that line is an oil line. it weird for me cause i just gave the line a bump and it broke off.


acually the brown stuff on the block i think is the from the stator probably melted like mine but dont touch it the stator it might still be good unless u dont have the charging system?