Q: Instilling on a 2001 Chev S10 Fuel Pump on 2001 Chevrolet S10

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I need some help. on instilling this pump i got the old pump out but can not get the new one back on the o ring will not go all the way up. on the pump and to lock the pump in is a C ring Grrrr. P.S i did put Lubricant on the ring so i push and push and will not go all the way down so i can lock it in

(1) Answer
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ok i will do that now and see and get back to you thank you

It work i got the new pump on i did what you said and it went on so i taken the old one off put on the new one and add lub under the new pump and it work

thank you for all your Help