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External fuel pump 1989 115 hp

M

moodyshield

Member
Hi

I bought a 1989 19ft Bayliner with a Johnson V4 115 engine which has been thoroughly serviced but there remains one issue. The boat runs on full revs for about 10 to 15 minutes and then loses power. Once the primer bulb is pumped then its back to full power. It would seem to be a fuel pump problem. My mechanic has suggested putting an external fuel pump in. Has anyone had any experiance with this sort of set up?
 
Yes although the bulb is soft

Yes although the bulb is soft rather the outright flat.

I have spoken to the mechanic who installed an external pump (120psi) but has found it is too strong. When the throtle was pushed forward the carbs were flooded with fuel. He is currently looking for a lower pressure pump (something like a 30psi).
 
"ok,..i thought u were referri

"ok,..i thought u were referring to an old style fuel pump,not an elect auto pump...those are a very dangerous setup..use the old style."
 
"The fuel primer bulb simply b

"The fuel primer bulb simply being soft BUT fully expanded to its normal shape is normal. Being drawn inwards towards a flattened position indicates a fuel restriction.

In total agreement with JWB about the electric fuel pumps...... go back to the normal type pump.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:

http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"
 
Thanks for these responses.

Thanks for these responses.

Can you explain why it is dangerous?

Also when you say old style pumps can you explain a little more about this option and whether it is something I can do myself (with limited knowledge)

Regards
 
"Elecctric fuel pumps can &#40

"Elecctric fuel pumps can (and usually do) exceed the normal fuel pressure being applied to the carburetor. This causes excessive fuel to force the float needle valve and float to the open position resulting in the fuel mixture flooding the engine compartment area.

The electrical system, sparks at times, combustion explosion are all present under the shroud (hood).

One mishap...... BOOM!

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:

http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store"
 
Re: External fuel pump

I think if everyone on your boat wears safety glasses, a crash helmet, and a life preserver over a fire suit they'll probably survive.....probably. :)
 
Re: External fuel pump

I hate to sick my nose in here, but an electric fuel pump is a big no-no on a boat. Usually they're hooked up very simplisticly, no safty features (free flow shut off valves and the like) so as long as theres power from the battery, the pump will keep doing its job. Now it could be on fire shooting gas out untill the wires cross and short out, or till the battery blows, (long time) and there you are in a boat with what is basically a flame thrower... Like Joe says BOOM... if you wake up after that you might find yourself being soaked with flaming gasoline.
 
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