Q: My buddy has a Subaru Forester that I have replaced the fuel injector o-rings on 3 times now and it continues to blow the rings

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My buddy replaced his head gasket, timing belt, radiator, plugs, and wires last weekend after it was all back together his injectors on the drivers side blew the o rings on the top of the injector he & his buddy who is a mechanic from out of town went to oreillys and bought felpro o rings said to be oem they put them on all injectors because he was worried that the other side would blow next about 2 days later they blew again so I replaced them for him this time because his buddy who is a mechanic went home out of town about a day after I replaced them the opposite side blew so I replaced those & those lasted a day now they have blown again I have checked each time I had done them that they are seating correctly in the fuelrail and are even I tighten them down a little bit on each side so that the pressure is evenly distributed as intighten then to insure they correctly seat I have noticed though that the felpro orings I have bought that say they are "oem"are tad thicker then the stock
My car has a manual transmission.

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