Anybody use low pressure fuel pumps with their outboards?

[gjmsd]

I recently bought a low pressure fuel pump (3-5 psi) to replace the bulb for my outboard. The reason I thought I needed it is because I installed a tank in the bow and there is 20' of hose back to the engine. My plan was to use a on-off-momentary switch to run it. I'd use the momentary side to prime it and leave it off while running letting the engine pump pull the fuel back with the option of leaving it on while running if needed. This is the way my plane works, takeoffs and landings are with both an electric and engine mounted pump and during normal flight, only the engine pump is running and the electric gives no pressure or restriction. Unfortunately, with the boat pump off it appears to be to restrictive to use. Does anyone use one of these with remote mounted tanks and if so, is there a problem leaving it on full time? Or should I get rid of it and go back to the bulb to prime?

 

[Haffiman]

Re: Anybody use low pressure fuel pumps with their outboards?

First of all I would say that installing a fuel tank in the bow is not a very good idea. Low on fuel and some waves and you may be in trouble getting a clean supply. Long time ago OMC had an electric primer pump with by-pass that was delivered with the V8 engines. You primed it up with a spring loaded switch and the bypass system took care of the rest when running.
http://www.marineengine.com/parts/j...er=Evinrude&section=Electric+Primer+Pump+Assy.

 

[metriccrescentwrench]

Re: Anybody use low pressure fuel pumps with their outboards?

What kind of pump did you get. And just out of curiosity, why do you need a fuel tank in the bow?

 

[gjmsd]

Re: Anybody use low pressure fuel pumps with their outboards?

I added a bigger tank that wouldn't fit in the stern and since I was also added a much larger engine (135 instead of the original 75), I wanted to move as much weight forward as possible. It is a low profile speedboat and sits low in the back as it is. May not need the pump, just not sure yet.

 

[Scott Danforth]

Re: Anybody use low pressure fuel pumps with their outboards?

and if the line has a break the pump fills the boat with fuel and blows up. if the line has a break with a siphon line, the engine quits running, you investigate and repair.

there is a reason that there is not electric in-line pumps on outboard fuel lines. your motor has a fuel pump on it. the bulb is only for priming.

 

[BonairII]

Re: Anybody use low pressure fuel pumps with their outboards?

And just out of curiosity, why do you need a fuel tank in the bow?

I have a '67 Glasspar that came stock with a bow mounted tank. Even has a fuel door on the top of the bow (see pic). I just cleaned it out and replaced all the fuel line and added a clear inline filter also. Haven't run the motor using the bow tank yet, but the PO used it for years with no probs at all.

 

[5150abf]

Re: Anybody use low pressure fuel pumps with their outboards?

Your engine should be bale to pull gas that distance pretty easily and it is generally regarded as a very bad idea to put an electric pump on an outboard which is why OMC never did it for the reasons listed above.

 

[Haffiman]

Re: Anybody use low pressure fuel pumps with their outboards?

Just be sure you use a 3/8 hose, bulb, nipples etc all the way and drop the quick connector at the engine!