1992 Mercedes-Benz 300TE Q&A

1992 Mercedes-Benz 300TE Question: Fuel Pump relay MAS type failing....??

When I jump pin 1 and 2 I ghet excellent flow fuel into a small container for good 30 seconds... then I install MAS relay (which has fuel pump relay inside) and only get trickle for 2 seconds...tried used spare....flows good for only 3 seconds.... is it possible both MAS relays defective.......or isthere other possible electrical vudu thing going on ??? TX -
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