Quick question- electric pump for carbed engine
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Postmaster
Joined: Oct 2005
Posts: 3,724
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From: Clarksburg WV
Quick question- electric pump for carbed engine
Guys, need a question answered as I have almost no experience with carbs.
At my work we have an old Clark forklift with a flathead straight six and some sort of one barrel updraft carb.
The mechanical fuel pump crapped out on us about two weeks ago and we need to get it back up and running, and we're looking at putting an electric pump on it.
Here's my question...I found a pump that looks like it will work nicely, but it comes in two different styles for the same price. One does 25 GPH/95 LPH at 1.5-4 PSI, the other does 32 GPH/120 LPH at 4-7 PSI. I don't know which one I should use. 1.5-4 psi sounds a bit low, but I also can't believe this engine needs 120 LPH from the bigger pump
Also, there was no regulator on the stock setup (unless there was an internal regulator somewhere...it went tank-filter-pump-carb), will I need to add a regulator & gauge?
At my work we have an old Clark forklift with a flathead straight six and some sort of one barrel updraft carb.
The mechanical fuel pump crapped out on us about two weeks ago and we need to get it back up and running, and we're looking at putting an electric pump on it.
Here's my question...I found a pump that looks like it will work nicely, but it comes in two different styles for the same price. One does 25 GPH/95 LPH at 1.5-4 PSI, the other does 32 GPH/120 LPH at 4-7 PSI. I don't know which one I should use. 1.5-4 psi sounds a bit low, but I also can't believe this engine needs 120 LPH from the bigger pump
Also, there was no regulator on the stock setup (unless there was an internal regulator somewhere...it went tank-filter-pump-carb), will I need to add a regulator & gauge?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Conventional carburetors usually need around 5 PSI. Much more than that will push the float open, but some carbs can handle a little more. I am not sure if an updraft carburetor would be different. You'll probably need to use the larger one with a regulator; it might be a trail and error process. Older stock Ford motors with mechanical pumps only require about a 22-23 GPH flow rate, and if this is just a forklift the demand would probably be even lower. Is there any chance you can get a replacement mechanical pump? That'd be the simplest route assuming you can find one. With the electric pump, you'd want to install a regulator, then you'd have to plumb the return line, and wire the pump.
