I agree. Maybe it was already mentioned but one test I can think of is you could hook up a light in parallel to the power that runs the pumps..so when the power to the pumps go out...so does your light bulb.

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oh ok, got it. for some reason I was thinking that the tests would only be doable if I had a FPR, but now I get what you're saying. I have an extra glove box light assembly, I'll wire that to the fuel pump and run tests from there. Where are the fuel pump connectors located?

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1990 190E 3.0L

That is a good question. I'm not sure where the harness connects at. I think I posted a link to the FSM PDF about the wiring. It might have some connections listed on it that you could look up in the component location index.

__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k