1980 DL, B21F, K-Jet.
I tried to check the spray pattern of the injectors per Bentley's CI section. I hotwired the fuel pump (30 to 87) with a jumper made according to their instructions and which is in working order. I pulled the #1 injector (they say remove them all), hit the switch to turn on the pump, lifted the sensor plate and got no spray. Not even a drip. Not even the minutest seepage.
I replaced the injector and pulled #2. Same result.
The book doesn't address this condition which makes me think I did something wrong. But I ran the pump this way last fall to do the basic CO adjustment. Fuel welled up in the port like it should and backed off when I adjusted the mixture screw. I don't think it's the jumper.
The only place I deviated from the procedure was not to remove all the injectors at the same time. What difference would this make?
Could the injectors be so dirty that they don't test but the car still runs? Or am I looking at a pressure problem?
The car has 101,000+ miles on it. I think these are the original injectors. Both fuel pumps and filter were replaced at around 95,000 miles. The tank was a little over 1/2 full at the time of test.