Don't think yours is ok. Get under the rear and visually inspect it.
The M116 and M117 V8's survived production for over 20 years (1970 to 1991), so now these engines are all 30 to 50 years old. The rear fuel delivery system is an important part of these engines and it is often neglected even by professional mechanics. Recently I have seen two cars that had their fuel pumps replaced professionally, but the old fuel hoses were not changed! Every single one of these old V8's I have seen in the past 5 years needs something done back there whether it be for safety, reliability, or performance. Once again, if you want it done right you need to do it yourself. Watch the video on my recent acquisition of a red 380SL that I named Cherry.
One of the very first things I inspect on these old V8 cars Is the fuel delivery system - and sure enough Cherry's needed some major TLC. So I decided to come up with a kit with instructions that would help other owners perform this important job. Then I found the fuel pump leaking on my 300SEL 4.5 and decided I had to come up with a kit for the early EFI D-jetronic V8's. This was especially challenging since the fuel pumps for these V8's are no longer made. Next, the requests starting coming in for me to produce a kit for the late 1970's 450SL, and next will come the twin fuel pump overhaul kits for the 1986 to 1991 560SL, 560SEC, 560SEL and 420SEL.