Fuel pump on Merc

[91eagle]

I have an old 2.4 Mercury a friend of mine told me that when I build it ....which I am now I should block off the fuel pump on the side and run an electric one is this a good or bad idea? and if I decide to do it what's a good pump to run ? Do I have to make a block off plate or is there somebody that sells them.. I appreciate any input Thanks guys

[W2F a V-King]

Assuming your building it back with carbs...

I run this electric pump on my 2.0L Mariner mounted at the fuel tank outlet. Wired with a relay. Spin my little motor up to 6500 no fuel delivery problems at all.

https://www.ebay.com/itm/Airtex-E833...item1ec15ffdaa


I also run this water separator/filter just after the pump.

https://www.ebay.com/itm/NEW-R12T-FO...item3f63508e7f


I left my working stock pump in place, the electric pump will push through it fine and with no damage. I figure the stock pump will be a backup in the event if the electric pump ever fails.

It will require the use of good hose clamps everywhere. I like the fuel injection style clamps..jmo

The only thing you might want to know about the pump is it is not an on demand pump, it doesn't cycle on and off. It runs anytime the key is on.

[91eagle]

Thanks

[91eagle]

I never thought about running it threw the pulse pump good idea .... a lot easier than trying to block it off

[Onetime]

"I left my working stock pump in place, the electric pump will push through it fine and with no damage. I figure the stock pump will be a backup in the event if the electric pump ever fails."

For this to work you have to have an electric pump that will allow flow through the pump of and most don't. Otherwise if the electric fuel pump fails it blocks the flow.

I rigged my boat with an electric fuel pump and kept the pulse pump. Just had a pump fail and that engine wouldn't run. Had thought of this when I was rigging and use AN fittings at the pump. Carry a coupling fitting in the boat so I can bypass the electric pump and just utilize the pulse pump. Saved a boating day recently when the electric pump failed right after launching.

[W2F a V-King]

"I left my working stock pump in place, the electric pump will push through it fine and with no damage. I figure the stock pump will be a backup in the event if the electric pump ever fails."

For this to work you have to have an electric pump that will allow flow through the pump of and most don't. Otherwise if the electric fuel pump fails it blocks the flow.

I rigged my boat with an electric fuel pump and kept the pulse pump. Just had a pump fail and that engine wouldn't run. Had thought of this when I was rigging and use AN fittings at the pump. Carry a coupling fitting in the boat so I can bypass the electric pump and just utilize the pulse pump. Saved a boating day recently when the electric pump failed right after launching.

Good thought. Haven't had to try it in fail mode. But do carry "stuff" with me when I go out.

Thank you for the heads up...will make sure my stuff bag has a 3/8" bypass for the pump

[90 5.0]

The factory pump is fine for a stock 2.4 200 carb.

If you start doing a lot of mods you’ll Need a bigger pump but not until then.

The rebuild kits for the pulse pumls are cheap and simple too.

If it goes out just rebuild it.

[j_martin]

The factory pump is fine for a stock 2.4 200 carb.

If you start doing a lot of mods you’ll Need a bigger pump but not until then.

The rebuild kits for the pulse pumls are cheap and simple too.

If it goes out just rebuild it.

Like ^^^^ says. The stock pump works fine. Filters and fittings are a downer though.
The stock small lawn mower type filter is inadequate. Bypass it and install a good fuel/water separator filter between the tank and the motor.

After market bayonet fuel fittings (plastic) will not flow enough fuel for a 2.4. Best is to just eliminate the bayonet fitting altogether and run the fuel line into the engine and to the oil injection T, or fuel pump if you eliminate the oiler.

This little square hustler of a pump works hard. It's worth two bits and an hour to refresh it for springtime preventative maintenance.

These carbs flood easily with too much fuel pressure. You can overpower the needle valves with the squeeze bulb.

[W2F a V-King]

Had zero issues with my set up. No flooding. I wanted a good water separator and filter, and I feel like the stock pump would have flow issues with the extra plumbing and restriction of the filter, albeit slight. Especially since using it on the suction side of the OE stock pump. Didn't put it on for a performance upgrade.

I haven't put a pressure gauge on mine. The Airtex website claims 5-9 lbs. http://www.airtexproducts.com/single...337&id=98756AX

No flow issues or leaks with supplied metal fittings. No plastic ones came in my kit.

No more pumping up the primmer bulb.

jm .02