Quote:
Originally Posted by boucher racing
I am using the factory mechanical fuel pump. It is boost referenced from the air cleaner spacer. It is suppose to raise the fuel pressure 1:1.
Top side:
I drilled and tapped a brass nipple on the 45deg edge. This is the bottom side of the fuel pump. The pressure from the boost pushes against the bottom side of the rubber diaphragm inside.
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This setup is also what I did...Just some more good info on mechanical fuel pumps... if you want to run a 4bbl or double pumper you should run the fuel pump off of a 1984 L6 250 which had a base pressure of 6-8psi instead of the 4-6psi of all earlier L6 250 mechanical pumps. As well boost referenced mechanical pumps are good to 12-14lbs of boost after that, they cant keep up.