FI Fuel Pump location? Options

[Kerrys914]

Hey guys. I read somewhere that the FI fule pump doesn't suck the fuel from the tank, is this true?

The fuel pump must be located below the lowest point in the tank to make use of all the tanks capacity???

I (PO modification) currently have the fuel pump located below/near the battery shelf. Is this too high?

Cheers (IMG:style_emoticons/default/beer.gif)
Kerry

[ArtechnikA]

thanks for the explanation, so moving the fuel pump done simply to lower the temperature in which it is operating (?). Does the pressure the gas is kept under while running through the gas line keep it from turning into vapor when it approached the engine?

there are several factors involved, and several opinions (hi Brad!).

yes, mostly it's done to move the pump, which can generate and retain quite a bit of heat all on its own, to a cooler location - in the stock location, the right side heat exchanger dump valve is blowing hot air right on it.... also, it's much easier to push a fluid than to pull it, and if you're really close to vaporisation point to start with, lowering the infeed pressure by sucking on it doesn't help. so keeping the inlet line short, and directly above the line, helps prevent fuel boiling.

increasing the fuel pressure also helps prevent vapor lock in the loop, but i'm not sure it does very much to reduce vapor in the feed line.

Brad's probably right that the factory approach to the early cars was to increase the pressure (rather than recall a lot of cars and move it on their own dime) -- but later cars ('75 & '76?) saw the factory move the pump to the front.