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Old 08-02-2005   #3 (permalink)
namba209
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Location: Imperial Beach, CA South of San Diego
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Manny, you need to have the pressure Gil stated. It take that pressure to get the fuel atomized into the combustion chamber. A surge tank is a good idea, but, in order for one to work correctly it needs to be vented and/or overflow back to the fuel tank. Check out my recent Willit? thread posts, I've got pics of what I'm using for the V-6 with Sequential Fuel Injection. I've got a low pressure filter between the tank and an electric feeder pump at the rear of the car. The feeder pump fills the surge tank which overflow back to the fuel tank. The surge tank feed a high pressure electric fuel pump, which bleeds off fuel in excess of 70psi. That bleed fuel also goes back to the gas tank. From the high pressure fuel pump, I've got a 100 psi filter, I don't want bits and pieces of the fuel pump going to the fuel rail if it breaks apart. Then the fuel goes to the fuel rail where a pressure regulator on the rail bleeds off pressure in excess of 50 psi. That bleed fuel also goes back to the gas tank. I put an extra fitting in the filler neck of the gas tank for the overflow and bleed fuel to go back into the tank. If you want, I can draw up a schematic to show how I did all this stuff. But what you can do is go to your local auto parts store, check out their fuel pump books and get a pump that puts out 40-50 psi and a feeder pump that will keep your surge tank full as your high pressure pump feeds the fuel injectors. The reason your pressure drops now, is because you don't have enuff pressure to begin with and as your engine accelerates the injectors are opening faster that the pump can keep up with as the EFI sense a throttle opening and enriches the fuel mixture. Once a stable RPM is reached the pump then catches up, but it's still not enuff pressure or volume for proper fuel atomization so you go into fuel starvation. Not a good thing. Anything else you need to know or have any more questions, lemmee know.
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Ron
72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed.
75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next
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