Earlier today I almost got stranded when my 300TE wouldn't restart after getting gas. I listened and the fuel pumps wouldn't hiss at all and get power.
I called the tow company, but 15mins later I tried again and it hissed and started. Got home, turned off car and pumps wouldn't power on again.

I am guessing its the fuel pump relay due to the fact it seems to related to powering the fuel pumps.
Is there a test that I can perform to verify its this? Is there any other items that I should consider that could be a culprit?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

On some W124 ,if your car is a 124 i have looked but i did not see the model ., you can bridge contact 7 with number 8 to get fuel pumps running ,but remember they run all the time with 7 and 8 bridged.