Quote:
Originally Posted by 81white911
ok guys, i have no idea why the fuel pump runs when the ignition is in the "on" position, i agree it could be a safety problem, but it has been that way since 1999 and is a side issue to my main problem.
I did find a two wire original connection hanging loose, it come up from behind the distributor and air cowling. It is red/white and brown wires, female, and the connectors look like trailer hitch connections (round).
I removed the wur electrical connections and got the same results 70 psi for control and primary pressure.
Does anyone have thoughts about the fuel volume test? From what ive read i should get 1 liter in 30 seconds. I am relieving fuel from the pressure release button on the cis-k fuel pressure kit. Is this the correct way to do it.
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81white911,
When the control pressure and system pressures become the same in values or equal, the WUR is not allowing the fuel to pass through. Check the fuel flow of the return line of the WUR. This return line is connected to a T-connection of the main fuel return line from the fuel distributor and goes to the gas tank.
To measure the delivery flow rate of your FP, you could do it with FP mounted in the car or off the car.
On car: Disconnect the fuel delivery line to fuel accumulator and run the FP. This is not easy to do alone (solo) unless you have the correct set-up and extra fuel line to collect the fuel.
Off car: Simply remove the FP and bench test it but you need a special gas tank set-up to do this procedure. The on-car test is more convenient unless you have the hardware and set-up for a bench test.
Someone has suggested doing the flowrate measurement using the 6 injectors. This procedure will tell you the flow rate via the FD (fuel distributor) and the value of the flowrate obtained is no where close to the fuel pump delivery rate. WHY? A portion of fuel delivered by the FP is diverted back to the tank via the FD pressure release valve. Since a good FP can deliver excess fuel needed by a CIS, the excess fuel is directed back to the gas tank.
Any more questions? Just ask. Good luck.
Tony