Got hit from behind in my 89 blazer no my car won't start

Have you checked Google I found this hopefully it's not your timing or it may be flooded but doubtful have you tried spraying starting fluid into the intake while cranking it

If is fuel injected try checking the fuel regulator and if is has a carburetor possible bad choke or needle seat / worse case jump timing

Try giving it a shot of starting fluid. You don't say if it's actually firing. If it tries or runs for a few seconds off of the starting fluid then try changing the fuel pump relay. It's inside of the glove box on the left hand side behind the little door. If that doesn't work it's most likely the fuel pump.

did you do the obvious and check the fuses? if they're ok, it's probably the flasher, try using your 4 ways, if they work, then it's the signal switch behind the steering wheel, sometimes you can clean it, or the wire may have broken going to it.

how to replace a tailgate switch for a 1989 chevy silverado blazer

check pump wire for nicks or cuts

It's not worth doing all that conversion, buy the time you spend the time and money to convert the 89 4.3 to work on the 98 blazer, it would be cheaper to install a 98 vortec rebuild. The 89 4.3 have a TBI fuel injection system and the ecm on the 98 will not work and the bad news is that the ecm on the 98 also controls the transmission shift points and the 89 will not, so even if you swap the ecm to have the 89 4.3 engine work. the transmission will not shift. Sorry for the bad news but it would be cheaper to replace the 98 engine with the years of 1996 to 2001. Good luck and hope this helps. 

If it has a carberater.The flots are probley sticking

look at the drivers side rear of the engine next to trans

have someone check the starter/solenoid