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Old 06-09-2005, 03:14 PM

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Forced induction fuel pump options.

I've decided to go a different route with my rambler and twin turbocharge it. I need to install fuel lines soon and I'm not sure how large I should go.

First I suppose I need to figure what my maximum horsepower will be. The motor is a lt1 chevy that I still have to build and, the turbos are garrett gt32's. My target power level is 550 to 600 rear wheel horsepower.

I was planning on a 1/2" supply line and a 3/8" return. Not sure what I'm going to do for a fuel pump to ensure enough volume and pressure under boost but not heat the fuel when bypassing large amounts at idle and low cruise.

I'll have lots of questions as this project continues because it's my first turbo car and I need to fabricate everything myself.

Any help is appreciated. Thanks.

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Old 06-09-2005, 04:44 PM
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Those size fuel lines should be adequate. I would look at a company called Walbro for your fuel pump. They produce many pumps (for many applications including your specifically) that provide the nessesary high pressure for LT1's FI system, as well as plenty of volume. It should be all you need. On systems where the pump isn't in the tank, Id run a feeder pump to supply the main pump. In any case, you'll also want to run an adjustable fuel pressure regulator.

Id also insulate my return line if I was concerned about heating the returning fuel. There are also fuel coolers (like oil coolers) as an option that I cant say that I have ever used one. Youd want to get one with a fan to provide any amount of cooling capabilities (unless you can fit it somewhere where it will get air to flow nicely through it).
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Old 06-10-2005, 09:29 AM
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LT1, I went through some tech issues with my BG 220HR pump and line requirements a while back. My issue was fuel line size for the feed and return, BG Tech gave me lots of information, see the link below to that thread. Note that he wasn't keen on reducing the size of the return line, I went with the AN-10 both ways.

Fuel System Thread
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