Hi,

I've searched the forum but I'm going to throw this out in the hope of getting a straight answer.

On a 1972 280SE 4.5, should the fuel pump make an obvious noise if it's working properly?

My original pump neither pumped nor made noise. A pump that I bought from eBay makes a barely audible hum and I can barely feel something humming with my hand on the exterior. It does not pump fuel through it but fuel flows nicely from the tank with the output line disconnected.

I've owned cars before where the fuel pump made a very audible noise when the key was turned on.

You guys have been very very helpful with my project since I got it in February. I don't want to mooch from you guys too much but many of you are real authorities on these cars and you're a great resource.

Thanks,

Doug