You're right, that is a vent tube from the back side of the fuel pump
to a vacuum port on the carb. If the fuel pump broke the gas would go
up that tube to the carb instead of leaking into the bilge. If you
look close you can see the fuel pump below the spin on fuel filter.
That's actually the original merc setup even though the fuel pump and
carb are both holley now.

You're also right about the fuel line, it is all rubber, I don't have
any metal line. But it is double walled marine line and I could not
find that any code that said it had to be metal somewhere, just that
it either had to be metal or it had to be double walled rubber. I
can't argue that metal would be safer. The non-metal filter is also
marine but I agree it doesn't seem like it should be. I had some
water in the fuel tank troubles some years back and I put that in to
keep an eye on it but I probably should take it out now. On the other
hand I'm always tinkering so I can keep a pretty good eye out for any
signs of impending trouble. And it's just a bowrider lake boat so
we're not really "serious" boaters ;-)

On Mar 13, 6:33 pm, "Eisboch" wrote:
"Jim" wrote in message

link.net...





Very nice work James. Kudos to you. I just had a couple of thoughts
though. My recollector is getting pretty rusty, but something tells me
that once the fuel line reaches the engine, it should convert to double
flared steel. I also am wondering if it is OK to use a non metallic fuel
filter inside an enclosed engine space. I like to see rubber fuel lines
double clamped, but maybe that's just because I'm a belt/suspenders kind
of person.
Jim
"James" wrote in message
nk.net...
By way of credentials I built the engine in my boat. Just finished a
valve adjustment after a cam change this spring in this picture. Block
is a 40 over 350 from a 3/4 ton panel truck with aluminum heads and
intake. Roller cam, lifters, and rockers. Stainless marine exhaust with
Corsa cutouts. Plus custom cooling and lowered alternator and power
steering pump.

http://home.earthlink.net/~jamesgangnc/ebay/boateng.jpg

I am also curious about something. What's that yellow colored (appears to
be plastic) tubing that runs from the carb, down below the fuel filter and
down someplace for? Is that the float overflow?

Eisboch- Hide quoted text -

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