Any tips for priming a Mallory electric fuel pump - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-05-2011, 08:35 PM
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Any tips for priming a Mallory electric fuel pump

I'm having problems getting my Mallory electric pump to prime. The fuel tank is sumped and it's not possible to get the pump lower than the sump. It's within an inch of it tho. I got the tank from my buddy who went with a fuel cell. We had the same problem with it last year but put an air hose in it and pressurized the tank to get it started. Think my car has a vent hose in the fuel fill that I can't get to without some major work that's not allowing it to pressurize. Anyone have a simple fix for this problem?
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Old 09-05-2011, 10:51 PM
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If the level in the tanks is higher than fuel pump it should not have a problem or need to be primed,is the tank full?
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Old 09-06-2011, 06:37 AM
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The pump is about an inch higher than the tank sump. I've lowered the rear of the car and have about 5 gallons of gas in the tank. It should be higher than the pump level now. Just has air still in the pump, 110 octane is about $8.50 a gallon around here. Don't want to have to buy 15 gallons and have it sit around all Winter. Going to go back down and see if I can find the vent and plug it afterwhile.
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Old 09-06-2011, 08:06 AM
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Crack the line at the pump; fuel should dribble out and the air should escape. Also, check your hoses real close; the pump will draw air through a poor connection before it draws fuel. Lastly, you DO need a vent. Just curious is the tank foam filled? Good Luck.
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Old 09-06-2011, 08:32 AM
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That sounds like a genuine pain in the you-know-where.
All I can think of is possibly a frame mounted filter/reservoir with some kind of check-valve so that fuel cannot run back to the tank.

The filter (Have a look at a Fram HPG1) would also serve to protect the pump.
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Old 09-06-2011, 08:45 AM
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Quote:
Originally Posted by Capt. Zorro
I'm having problems getting my Mallory electric pump to prime. The fuel tank is sumped and it's not possible to get the pump lower than the sump. It's within an inch of it tho. I got the tank from my buddy who went with a fuel cell. We had the same problem with it last year but put an air hose in it and pressurized the tank to get it started. Think my car has a vent hose in the fuel fill that I can't get to without some major work that's not allowing it to pressurize. Anyone have a simple fix for this problem?
I had the same situation on my sumped Maverick tank and a Barry Grant pump. After much $$$ and frustration, I switched to a Holley "black" pump and never had a problem again...

Russ
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Old 09-06-2011, 11:34 AM
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Is there a return line that you can blow through,or remove the suction line from the fuel pump and pull a vacuum on it with a mighty vac or something or just blowing into the tank.I would take a vacuum gauge and hook it up to the suction side of the pump and test the pump.
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Old 09-06-2011, 12:08 PM
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Ok Houston we have fuel. My Buddy that I got the tank from came by and we disconnected the fuel line from the tank. Held the line higher than the fuel pump and poured fuel into it till it got it's prime.
Yeah, 66GMC that's the filter I have. Old Mallory 140 pump and 1/2" fuel line from the filter to press. regulator. Have 5/8 steel braided from tank sump to pump.
Think the carb is about a 950 cfm, I bought most of the parts from my buddy when he upgraded his car this spring. He ran 6.30's naturally aspirated and 5.90's with a shot of nitrous last year.
Thanks for the help.
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Old 09-07-2011, 09:40 AM
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Quote:
Originally Posted by Capt. Zorro
Ok Houston we have fuel. My Buddy that I got the tank from came by and we disconnected the fuel line from the tank. Held the line higher than the fuel pump and poured fuel into it till it got it's prime.
Yeah, 66GMC that's the filter I have. Old Mallory 140 pump and 1/2" fuel line from the filter to press. regulator. Have 5/8 steel braided from tank sump to pump.
Think the carb is about a 950 cfm, I bought most of the parts from my buddy when he upgraded his car this spring. He ran 6.30's naturally aspirated and 5.90's with a shot of nitrous last year.
Thanks for the help.
Hope it stays... Mine was a long-term issue that required constant worry, to the point of losing prime even while driving. Kind of embarrassing / dangerous to be on a busy four-lane and have the engine shut down, got tired of that real quick!

Russ
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