priming the injection pump
Back in post 4553, I noted that my injectors were ready to go. I installed them today, and learned a bit about priming an injection pump.
1) Snug up all the injection lines. They don't have to be tight, but they do need to be air-tight.
2) Block each and every return line leakage point. No big deal unless you've had a lot of stuff on the injectors apart.
3) If it was loosened at all, check that little bolt holding the return line banjo fitting on injector #3, and remember it is a tiny bolt that is hollowed so it breaks real easy. Don't try and crank it down. Just barely enough to snug it. I don't know what the torque value is on this thing, but I'll bet it is measured in gram-cms or something equally as tiny.
4. Plug the return line that goes back to the filter if you are vacuuming from the injection pump's hard return line.
And the pump will prime right up. This job would be easy and quick if you had about 8 hands, but I don't. And if there's any leaks anywhere (the 3rd injector return line bolt got me today) you'll be frustrated as you can be, because that air leaks in and spoils the party. Such as a cracked return line (the rubber hoses).
That's my story, and I'm sticking to it.
Cheers,
PH
Oh yeah, the other part of my story is that I got my car started, and the replacement pump I used (I got frustrated with my original pump that wouldn't prime - see above - and used this replacement.
Well.
After it was running I was doing a visual check over and I noticed a little fuel on the backside of the pump. I wiped it up with a paper towel. I started getting the rest of the stuff ready to do a final button up. After about 5 minutes, I check again, and the replacement pump is leaking. I actually saw a tiny set of a few bubbles appearing at the lower part of the quantity adjuster, just above the pooled fuel I had wiped up previously.
I'm a little frustrated now. I AM RIGHT BACK TO WHERE I WAS A MONTH AGO, WHEN I TRIED TO REPLACE THE PUMP HEAD O-RING BECAUSE MY ORIGINAL PUMP WAS LEAKING.
Oh, <bleep>. It has just been that kind of day. What a way to waste a vacation day.