86 325 with an 87 325i engine.
I've been having fueling issues with this thing since it was swapped in.
-New in tank and external fuel pump and filter
-CPS ohms out within spec
-Coil is getting power
-Cap rotor spark plugs and wires are brand new
-New fuel relay
-New main relay
-New fuel lines
Fuel pressure shows ~38 PSI at idle, jumps to ~45 when throttle is blipped. Fuel return gives about 16oz of fuel in ~20 seconds. Pinched return line shows fuel PSI jump to 80+ before I released it. I can sit in the driveway and rev up the car to the limiter with no issues. Hooked up a gauge while driving (under load) and at about 3000-4000 RPMs the fuel pressure drops steadily down to 10 psi or so and then goes to zero. Tach does not die. No vacuum leaks, no fuel leaks. All testing done with a fuel tank. Looking for some insight as I'm signed up for a track day in this car on Sunday.
I've been having fueling issues with this thing since it was swapped in.
-New in tank and external fuel pump and filter
-CPS ohms out within spec
-Coil is getting power
-Cap rotor spark plugs and wires are brand new
-New fuel relay
-New main relay
-New fuel lines
Fuel pressure shows ~38 PSI at idle, jumps to ~45 when throttle is blipped. Fuel return gives about 16oz of fuel in ~20 seconds. Pinched return line shows fuel PSI jump to 80+ before I released it. I can sit in the driveway and rev up the car to the limiter with no issues. Hooked up a gauge while driving (under load) and at about 3000-4000 RPMs the fuel pressure drops steadily down to 10 psi or so and then goes to zero. Tach does not die. No vacuum leaks, no fuel leaks. All testing done with a fuel tank. Looking for some insight as I'm signed up for a track day in this car on Sunday.
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