Quote:
Originally Posted by Mxfrank
Did anyone say anything about using pressure to vary mixture?
9 bar is a lot of pressure, enough to be a potential hazard to the car and to the mechanic. Even if it's only between the pump and filter, there's a chance that a weak line can blow out. The system is supposed to work at a 40% duty cycle at WOT. It's a risk to run at full pressure, and the test is irrelevant.
He's already bench tested the pump, so we know it works. He can start the car on ether (not recommended, but what's done is done). So we can be fairly sure the engine works. What seems to be missing is fuel pressure, or more specifically, what's missing is power to the pump when it's in place. So the focus should be on the sensor and the pump control module. It's not hard to imagine how these elements could be damaged by running through a chassis bath at a car wash, as they are under the car. Something as simple as opening each electrical connector and spraying with silicone might displace any intruding water and get him going. Or it might that the filter has picked this moment to clog. Syljua's documents clearly explain how the pump system functions. Concentrate on pages 25-28 of the training document, and you're sure to find the problem.
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I totally concur. If is starts by putting 12v directly to the pump I will still know jack. The possibility of a filter being so clogged suddenly that it wont allow even 1 PSI through is remote, but a pressure relief valve open in the filter could explain no pressure. But when the pump does run you can feel it run and generally it doesn't run. But the few times it did run it did not build pressure???? Although we measured voltage at the pump connector we didn't measure current which I believe we now have the capability to do.
The schematic shown in the training manual shows 3 ports on the filter but the car in question has 4 ports. This may have to do with the SL having a partition in the tank and needing to return to both sides.
And I just realized Syljua posted two links the first one is the key. The owner of the car is in FL now so this will have to wait a bit.
Many thanks for all the replies.