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Re: Fuel Pump Help
Posted by Andy in PDX (more from Andy in PDX) on Sat, 24 Feb 2007 10:47:30
In Reply to: Fuel Pump Help, jpistey, Mon, 19 Feb 2007 08:33:05
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I'm not sure which injection you're using now, but the original D-jet pump has a lower output and runs at a lower system pressure than the later injection pumps. You need a pump that matches the injection system's needs. I know that the later ('75- 99 and all c-900) systems have the pump built into the top of the tank, but as long as there's fuel flowing through it, it can be placed anywhere. Though it's designed that way for space usage, it isn't really necessary for the end to be submerged in the fuel. The fuel flowing through the pump lubes and cools it. I'd say, get the pump designed for the injection system that you're using.
According to the '69-'74 manual, the original pump for the D-jet that came in the car has a fuel output capacity of 50 liters per hour (I'm not sure how this was measured or how it compares to the later system's outputs below) and the working pressure in the system is 2.0 to 2.2 bar (28-31 psi).
The '86 900 manual I have covers the 16V engines. The working pressure should be 2.5 bar for a turbo and 3.06 for a normally aspirated engine. Pump output should be 900 cubic cm or 1.6 pints over 30 seconds with a 2.5 bar or 3.0 bar back pressure.
As I say, I don't know how the D-jet output was measured, whether it's free-flow or with back pressure.
If you're running a 16V turbo, use the lower pressure for comparison, if you're running a normally aspirated engine, use the higher pressure.
posted by 216.239.17...
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