I’m having fuel problems with my mom’s K5 Blazer with a 350 TBI and automatic trans. My brother has been driving the Blazer and said it has been starting really rough. Sometimes he has to crank it over 8-10 times before it will start. The first thing I did was check the spark and we had none. I think I’ve replaced most of the ignition on the truck: Pick-up coil, Module, Coil, Cap, Rotor, Wires, and Plugs. It seems like we have really good spark now, however now the truck will start for maybe 2-3 seconds and shut off. When we key the ignition without cranking, the fuel pump will come on for a couple seconds and shut-off, I think this is normal but would like confirmation. It looks like we are only getting a couple dibbles of fuel out of the injectors. Also when we checked the harness side of the fuel pump connection the test light seemed really dim. Because the filter looks original (????) my plan of action is to replace it first. The questions I have are: 1) If the filter doesn’t solve the problem what is the best way to check fuel line pressure. A friend of mine who is a mustang guy says their injection systems have a Schrader valve that he mounts a pressure gauge directly to, I couldn’t find a similar valve on my line, is there one and where would I find it?? 2) I understand the fuel pump relay is on the passenger side firewall directly above the passenger side intake manifold, is this true and what is the best way to check it? 3) What is the best way to check the fuel pump without dropping the tank? I would assume checking line pressure and checking power to the pump, can I run power directly from the battery to the fuel pump to bypass any relays for trouble shooting purposes only? 4) Does anybody know where I can find comprehensive information on how this TBI system works and what components are involved? I’ve got a 78 Jeep CJ-5 with a 350 and a Quadrajet and would like to consider some sort of injection system, but obviously don’t know much about them. Also traditionally when my mom’s blazer was running it would run a little rough and maybe even surge a little when it is cold. From the research I’ve done it sounds like this could be caused by a variety of sensors and a variety of reasons. Would just like to get her truck running tip top! 5) Any suggestions on what else to check would be greatly appreciated! Sorry for the long post and thanks in advance for your help!