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Electric Fuel Pump to replace mechanical pump on 500 EFI

Electric Fuel Pump to replace mechanical pump on 500 EFI

Old 04-03-2020, 09:04 AM
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Default Electric Fuel Pump to replace mechanical pump on 500 EFI

Anyone have any history with going from the mechanical fuel pump to electrics on 500 EFI's , or any Merc Racing EFI's?

Was looking at the Holley Red Pumps that are set at 7PSI to feed the stock electric pumps. Not sure if 7 PSI is enough (though flow should be there) or the best way/location to mount the pump.

I know electric to replace mechanical may have drawbacks. But water pump failures due are more common due to the lube problems in those applications.
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Old 04-03-2020, 06:24 PM
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Weldon 1100A pump will do you. Plus its the only pump that is designed to draw fuel and not gravity fed. I have them on 3 boats and super quiet. You could use this as a stand alone pump with regulator. I'd run an Aeromotive regulator.
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Old 04-03-2020, 06:32 PM
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Alot comes with switching up fuel pumps. I used a weldon but had to install a new switch that can accommodate return style system, along with a regulator and return lines to both tanks

Not really a drop in solution
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Old 04-03-2020, 06:57 PM
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Originally Posted by larose481 View Post
Weldon 1100A pump will do you. Plus its the only pump that is designed to draw fuel and not gravity fed. I have them on 3 boats and super quiet. You could use this as a stand alone pump with regulator. I'd run an Aeromotive regulator.

Isnít the 1100A an Aeromotive? I looked at that as well, its the setup recommended by Whipple.

The Holley setup seems simpler as it still uses the cool fuel. The Aeromotive needed a small cooler /rrturn which I donít understand how to setup.
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Old 04-03-2020, 10:17 PM
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Old 04-04-2020, 07:05 AM
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Thanks for clarifying, confused with the A1000 Aeromotive
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Old 04-05-2020, 10:05 PM
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Thats the one.
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Old 04-07-2020, 09:35 AM
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Didn't realize Merc had a 'fix' for the vapor lock situation( Kit 862264A2 ) any one have luck with that? Nice simple package from what I can see (all the viring and plumbing is included - with instructions for people like me with little real understing of the fueling side), curious if it works well for stock Mec applications?


Last edited by snowrunner; 04-07-2020 at 09:40 AM.
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Old 04-09-2020, 10:21 AM
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I installed it on an old 27 Fountain I had with 502. That thing wouldn't start for $hit after being rafted up for a while, was towed in so many times - wife was always scared to shut off the boat. I tried everything until I discovered that pump kit that Mercury has. It ABSOLUTELY cured the issue on that boat. Very easy and quick to install. I did not install the backflow valve that they also prescribe may fix the problem. There is a service bulletin that shows the pump kit.

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Originally Posted by snowrunner View Post
Didn't realize Merc had a 'fix' for the vapor lock situation( Kit 862264A2 ) any one have luck with that? Nice simple package from what I can see (all the viring and plumbing is included - with instructions for people like me with little real understing of the fueling side), curious if it works well for stock Mec applications?
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