Fiddled with the cold start injector and its line today. I got it to a very slow leak, basically, the nut around the connection gets moist.

Does the cold start injector shut off relatively soon?

The thing that scares me is a build-up of vapors under the hood and having that go KA-BOOM!

I have 3 cold start injectors, a BLUE, BLACK, and BEIGE one. These colors are present at the electrical connector for the cold start injector.

What do these different colors mean?
(My guess is that a different volume of fuel is sprayed for each one...)

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)