Hello, I have a 1998 blazer 4 door ls 2wd, I replaced the head gaskets, after putting everything back together, I have no fuel pressure, put new fuel pump, when I turn key on no lower to pump, fuel pump does not come on,replaced the fuel pump relay twice, I checked all fuses, it does come on when I use a jumper wire and bypass the relay, so that means The pump is good and it had a ground, so why doesn't it come on when I turn the key????? Can someone please help??????!!!! I'm so confused and frustrated!!!! I've spent a lot already trying to get this blazer running, and still havnt.