I have another thread going about having no fuel pressure after a LIM replacement, but I had a couple of very specific questions that I wanted to ask independently of that thread.

1. Could it be possible to damage the injector assembly (spider) by blowing compressed air through it. I did this trying to clean out some debris without stopping to think that the air pressure might hurt something internal.

2. With the spider removed, and with one end of each of the fuel lines connected into the spider body, can you blow air into the supply fuel line at the open end of the fuel line and hear it coming out of the open end of the return line? or would the pressure hold because of the pressure regulator?

 

I would say you could certainly damage the spider assembly by blowing compressed air in it. It's ment to hold around 62 psi of liquid pressure, not 160psi of air pressure(assuming you used an unregulated blow gun)

 

I only used about 50 lbs. of air pressure. Less than what the fuel pump delivers.