With the old fuel pump removed the new pump assembly can going. Be sure to line up the alignment tab so that the level sensor float/arm is in the right position to sweep empty to full. Use the new o-ring that is provided, I find some o-ring safe lube suck ad sylglide or something suitable for brake caliper slide pins works good. Stay away from oils or grease as a lube that could swell up the o-ring and cause sealing issues down the road. Push down against the fuel pump assemble springs to seat i