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another stupid fuel injection question 700

Ok folks, this one may be my most ignorant question yet.

While taking out the injectors to see why one was leaking, I noticed the following:

There were no little plastic caps on the injectors, like what is shown in every injector picture I've seen. What do these little caps do, and should they be installed? I know that they are in the replacement o-ring kit.

Wouldn't a plastic cap melt in the engine?

TPL
--
1991 740 B230F 135K miles






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