I would complain about a total of $100 labor to diagnose and install, plus list price for the part. Whether the fuel pump runs is like the most basic thing to check, and all you have to do is put your hand on it while someone cranks the starter. Then it's about 20 minutes to drop the dash panel and replace the relay and put the panel back.

The relays seem to fail randomly. Personally, I carry a piece of #14 wire to bridge the contacts in the relay socket if needed.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe