SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 77Galaxie on April 21, 2016, 11:18:26 PM
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I'm thinking of running an electric fuel pump online with my mechanical one. I'm trying to cancel out an issue I've been trying to chase for the past couple years (boat stalling mainly at high speeds). I put vents in the caps, rebuilt carb and checked for any leaks in my fuel pickups. Anyways, what's everyone's idea on this and should it go between the tanks and the mechanical pump or between the mechanical pump and the carb?
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I believe if you're going to run electric fuel pump you should get rid of the manual fuel pump
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Its a good idea if you have some distance between tank/carb. Run the electric first an it will keep the mech always primed. If your trying to chase a fuel issue from tank to pump... bring a gas container an run your fuel line into it while boating. Thats how I was able to figure out similar problem years back(debris at pickup in tank). I changed my fuel line from 3/8 to 1/2 from tank to mech as well the water/fuel sep from 1/4 to 3/8 npt(= 1/2 line) By doing that it made the pull from mech pump way easier to get the gas to the pump. The other side from pump to carb is still 3/8 an works perfect into a 850dp holley. I have a built 466 BBF with about 450hp an pump is a carter marine 6psi @about 45gph.
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Do you have good fuel line some times the line will suck together when your really on it
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I'm going to replace all my fuel line but it seemed pretty rigid when I pulled it all out
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I put a new jegs electric fuel pump with regulator on mine a few months back seems to work fine and only 85$ I'm running a 454 with a 177 blower 800 cfm holly about 5300 rpm on a good day
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I put a new jegs electric fuel pump with regulator on mine a few months back seems to work fine and only 85$ I'm running a 454 with a 177 blower 800 cfm holly about 5300 rpm on a good day
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Do you run a switch to your pump?
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I run it off the key
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Also the pump is a little loud
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Run an oil pressure cut out switch.
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When it dies, what do you have to do to get it running again?
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Dont forget the relay
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Hey GT I've heard about the oil pressure cut of is that the law here in Cali/ AZ I could see why it would be a good idea and now the dumb question what do you have to do to get the pump running before the motor fires
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Never thought about that. That could contribute to the engine I'm rebuilding. Usually when it happens it stalls and I have to crank it a couple times almost like it's running out of fuel. When it stalls it's usually at higher speeds (although it cut out at lower before) but last time it did it to me I was able to kind of pump the throttle to keep it going but eventually stalled. I've had this issue for about 2 years and still chasing it down. I'm doing an engine rebuild, new carb rebuild and changing all the fuel lines and fuel fittings. I've even thought of changing to an electrical fuel pump cause of the very slight possibility of vapor lock with the hopes that something I'm doing changes the problem.
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Hey GT I've heard about the oil pressure cut of is that the law here in Cali/ AZ I could see why it would be a good idea and now the dumb question what do you have to do to get the pump running before the motor fires
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The only "law" I can think of would fall under the United States Coast Guard. So I guess you could say Federal law.
The way I see it is is just a good practice.
Let's say the needle stuck open bad enough to kill the motor, but there is nothing to kill the pump, it fills/spills fuel all over the engine, you go to crank it with your Auto Zone POS starter, BNAG... (very few of you will get that lol).
The switch is a three prong deal, the pump is energized with the start circuit with no oil pressure and the ignition circuit with oil pressure. It's essentially a double throw switch and the common goes to the pump power lead.
GT
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Do you have good fuel line some times the line will suck together when your really on it
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I added a stainless spring inside fuel line on a small tight curve to avoid collapse. I also opened up the vent in the gas cap a bit more.