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The hissing means everything is working fine as far as fuel pumps...and yes there are two.
Usually, when the hissing turns to "buzzing", then that is usually a clue that one of them is going to die soon...though there are some that claim theirs buzz and there are no ill effects.
My ML had a bad fuel pump, and symptoms ranged from hard starts (cold or hot) to just quitting while on the highway. Didn't hesitate, but when it finally died, I was stranded on a lonely two-lane over a holiday weekend!
The pumps are accessible by removing four bolts holding a plastic cover that protects the fuel pump system. I replaced a hose on my W124 in that area, but your only real issue is being able to crimp your inlet hose to prevent taking a gasoline shower while working! Disconnect the battery too to be on the safe side!
The OVP is around $80 and I would try that first. I'm not a fan of throwing parts at a problem, but I don't mind ruling out the cheap ones if i can.
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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