leusgs
Well-known member
Calling all Injection Pump experts! How does air get in them?
2000 ALH Jetta - starts and idles for 10-15 seconds, then dies. Lots of white smoke.
I believe I've narrowed the issue down to air getting into the injection pump. I've isolated the pump by running clean fuel directly into the inlet of the IP, and running the return line through clear hose into a container. So the factory fuel lines, filter, tank, etc are all out of the picture.
I am able to start the car after I Mityvac the return line to prime the system and remove air bubbles. It will start and idle roughly but will not rev, and dies after 10-15 seconds. Afterward there are lots of bubbles in the return line.
Have a look at this video taken about a minute after I shut the car off:
http://youtu.be/aPXRDVa8qrM
Immediately after shutdown there are even more bubbles in the line - the fuel looks almost white and creamy because there are millions of foamy bubbles!
I'm assuming the return line fuel should not be massively full of bubbles like this.
Could air be getting into the pump from somewhere? What are the possibilities?
2000 ALH Jetta - starts and idles for 10-15 seconds, then dies. Lots of white smoke.
I believe I've narrowed the issue down to air getting into the injection pump. I've isolated the pump by running clean fuel directly into the inlet of the IP, and running the return line through clear hose into a container. So the factory fuel lines, filter, tank, etc are all out of the picture.
I am able to start the car after I Mityvac the return line to prime the system and remove air bubbles. It will start and idle roughly but will not rev, and dies after 10-15 seconds. Afterward there are lots of bubbles in the return line.
Have a look at this video taken about a minute after I shut the car off:
http://youtu.be/aPXRDVa8qrM
Immediately after shutdown there are even more bubbles in the line - the fuel looks almost white and creamy because there are millions of foamy bubbles!
I'm assuming the return line fuel should not be massively full of bubbles like this.
Could air be getting into the pump from somewhere? What are the possibilities?