So a thought dawned on me today and I figured I’d toss it out to the brain trust here to see if someone can explain it to me...I mean, we all love opining on science and fluid dynamics, right??

My 35 has electric fuel pumps in place of mechanicals (not my preference, but I’m going with it for now). Instructions for any electric fuel pumps I’ve ever seen (Holleys in my case) say to place them as close to the bottom of the tank as possible.

Is this suggested to try and take advantage of siphoning properties?

If so, am I negating any benefit of placing at the bottom of the tank by having an anti-siphon valve on the pick-up?

And if the above two are true, why would the pump have to be placed at the bottom of the tank?

I look forward to any theories, lessons, lectures, or diagrams.

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I always thought the reason was that electric pumps would prime and push fuel better than suck it--- it seems that advantage would be negated by antisiphon unless your electric fuel pump is inside the tank as it is on most autos now. It would not necessarily negate the prime advantage perhaps as a column of fuel would still remain on the suck side of the pump to get it kicked off even with the antisiphon. But somebody probably knows for certain!

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