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  #1  
Old 08-22-2010
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Two fuel pumps-A4

As mentioned in a previous post, i had spark... no gas. after tracing the fuel line back to directly behind the fuel filter, i found a secondary electronic fuel pump had been installed. i removed it and wired it for testing, and i think she is shot.... sooo i just bypassed it, given that the A4 has its own mech. pump on the engine.am now getting fuel to the carb.

so, should i attempt to diagnose the elec fuel pump probs and reinstall or replace it? how much safety am a sacrificing by bypassing? what would you guys/gals do?
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Old 08-22-2010
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Should be no safety issues, Mick. IIRC there's a mechanical diaphragm pump on the engine block and as long as that works, it works. Usually they work "forever" or until the diaphragm ruptures, the mechanical parts of it are quite robust otherwise.

You could probably safely test the electrical pump by attaching to hoses and a 12V power source and then letting it transfer kerosene from one jar to another while you observed the flow. There's *always* some danger of fuels doing what they are supposed to do (exploding) but kero is much less likely to do that than gasoline. Many of those pumps MUST be cooled by the fuel they are pumping, so don't try to run it "dry" for anything but the shortest time.
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Old 08-22-2010
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Thoughtful comment from HS as usual.
On our Tartan 27' the fuel tank is actually above the engine with respect to the water line, so gravity actually feeds the fuel to the mechanical fuel pump on our engine and no need for a second pump at our fuel tank.
I am not sure how your G 30' is set up with respect to the relative height of the fuel tank to your engine. I have to believe that the 2nd fuel pump was added for a reason and if I had to guess I would bet that the 2nd fuel pump was added to insure that fuel would get to the engine fuel pump in heavier seas. If your boat was pitched forward or aft by larger waves this would change the relative height of your tank to the engine, perhaps even putting your fuel tank below the engine level - which would cause the fuel not to flow to the engine when you need it most.
By all means see if you can get the old pump beastie working again. OTOH, consider that a new Facet fuel pump from Moyer costs just over $100 and would likely last quite a while and give peace of mind if you get caught out in any waves while motoring. Just guessing but the 2-3 PSI pump would probably be fine for your application.
Disclaimer: this post is full of speculation.
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