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Fuel pump (suction)

Old 06-15-2020, 09:15 PM
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Default Fuel pump (suction)

I currently have a Mallory fuel pump that apparently is a pusher not a puller so I need to prime it to the the fuel to pump. My question is does anyone have any idea on a good pump that will pull the fuel up to it. Problem I have is it's hard to get mounted under the tank so I run out of fuel when the tank level is below the pump level which happens to be about 1/3 to 1/2 tank. Thanks for any help. It's a carb 502. 415 hp.
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Old 06-16-2020, 06:41 AM
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Only pump that will pull uphill with any consistency are the old school diaphragm or Weldon Electric.
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Old 06-16-2020, 07:21 AM
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Suggest checking the antisiphon valve on the tank. Its the barbed fitting that the rubber fuel line connects to.



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Old 06-16-2020, 11:11 AM
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Yup. ^^^^^

Also, the following based iff my old crusty hardening brain so please double check.....your Mallory could have a gerator type pump which is more efficient on the output side, but less effecient at ‘pulling/lifting fuel up lines’ then the vane type. Vane type is mire noisy then gerators.

As a fyi, many marine companies on carb’d sbc’s and liw hp 454’s that don’t have block provisions for mechanical pumps, use the Marine Carter Electric pumps. They are vane type, again, if I remember correctly.

Hope this helps, and please do a quick study in case my memory mixed up.

Last edited by SB; 06-16-2020 at 12:07 PM.
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Old 06-16-2020, 11:54 AM
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One of the Holley pumps will lift 18", I just forgot if it was the red, blue or black.
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Old 06-16-2020, 01:42 PM
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Weldon pumps advertise that they can pull as well as pump, unlike most electric pumps. I used a Weldon mounted on the block and it pumps like a beast.
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Old 06-16-2020, 05:47 PM
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I run mallory 140's. This is what I did. I mount the pumps as low as I can in the bilge. I then run a loop in the delivery hose that will keep fuel in the line to allow the pump to prime and create a vacuum.
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Old 06-17-2020, 10:26 AM
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Originally Posted by AllDodge View Post
Suggest checking the antisiphon valve on the tank. Its the barbed fitting that the rubber fuel line connects to.


I did that's been replaced with a regular barbed fitting clear through no valve

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Old 06-17-2020, 08:27 PM
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Originally Posted by riverrunner242 View Post
I did that's been replaced with a regular barbed fitting clear through no valve
So you're saying you removed the anti-siphon valve and have issues with it siphoning?
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Old 06-17-2020, 08:37 PM
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Originally Posted by Rookie View Post
So you're saying you removed the anti-siphon valve and have issues with it siphoning?
yes correct
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