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Old 04-16-2008, 02:15 AM
84Z 84Z is offline
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dual gastank sump pick up a good or bad idea?

So long story short, I'm building a small formula one car and the gas tank is pretty small, 1.7 gallons. The endurance race the car must go through will use about 1.5 gallons of that. The gas tank I made has a sumped area on it where it triangles downward. I was worried that under hard turning conditions the gas would slide away from a center pick up in the sump, so I was wondering if two pick ups, one on each side would be better? I'm only worried about the same conditions happening and one pick up is sucking in air, the fuel pump will not pull any fuel from the other pick up because air is easier to suck in then a liquid is. Do you thing this will happen or would the pressure be great enough to catch fuel too? The engine is a detuned gsxr600 and it's fuel injected. Thanks for the input.

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Old 04-16-2008, 02:58 AM
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In a word, no. If you have two pickups its like having a straw with a hole in it. As soon as one becomes uncovered in a turn, it will suck air. the best thing is to put one pickup in the middle.
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Old 04-16-2008, 11:34 PM
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Quote:
Originally Posted by 84Z
So long story short, I'm building a small formula one car and the gas tank is pretty small, 1.7 gallons. The endurance race the car must go through will use about 1.5 gallons of that. The gas tank I made has a sumped area on it where it triangles downward. I was worried that under hard turning conditions the gas would slide away from a center pick up in the sump, so I was wondering if two pick ups, one on each side would be better? I'm only worried about the same conditions happening and one pick up is sucking in air, the fuel pump will not pull any fuel from the other pick up because air is easier to suck in then a liquid is. Do you thing this will happen or would the pressure be great enough to catch fuel too? The engine is a detuned gsxr600 and it's fuel injected. Thanks for the input.
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Old 04-16-2008, 11:54 PM
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yeah, I agree, one pickup with a V bottom. I would install and additional V inside to funnel the fuel right to the pump pick up. The additional V if welded to the sides will prevent fuel from climbing the walls.

I have this feature in my Willys tank and it works great. It retains about 3/4 of a gallon in my case right at the pickup under any conditions except upside down. haha

I try to build my custom tanks with this feature as much as possible. I didn't invent it, my TIG welding instructor taught me this 40 years ago.
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