2001 Blazer LS 2dr 4.3 Vortec 6cyl engine.
Replaced fuel pump may 18th, overnight trip 2 HRS from home and it ran fine the whole way there. About 4 hrs after getn to the hotel we went to go eat and it wouldnt start. It would crank but not turn over and it was like the fuel pump had went out on it all over again. And we listened to see if the fuel pump was kickin on when the key was turned over but couldnt hear ne thing. We made arrangements to be towed home the next morning and when my husband went out to smoke he tried starting it and it fired right up. No prob! He left it running as we pakd QUICKLY and we drove it all the way home non stop with no probs at all! When we bought it a yr n a half ago the guy said the engine light being on was due to an O2 sensor and my husband pulled the codes and just as the guy said it threw the code for an O2 sensor.
My husband could clear it and the light would stay off for a few days b4 comin on again. He pulled codes at the hotel that night it wouldnt start and it showed the usual one and also showed a new code for the heated air flow sensor or something like that. Ne ways he cleared the codes and the light came right back on which it had never did before. When it started the nxt morning though the engine light had gone off and never did come back on the entire trip back home. After we were home it startd just fine a few times then it suddenly wouldnt start again. It once again acted like the fuel pump was bad and he couldnt hear the pump kick on. He dropped the gas tank and took the pump out, checked to make sure it was working and it was so he put it back in BUT he hooked it up and put the tank bak just enough to keep it in place but not tighten things down.
It started right up when he was done, so he left it like that a day and a half and finished tightening things in place the rest of the way. Then it started a few times no prob and today it stranded him at the store and refused to start again. We can hear the fuel system working next to the fire wall, but we hear nothing coming from the fuel pump again when the key is turned over. Each time it dont start, it will crank as if everything is normal but will not turn over/actually start. Please help us figure out what the problem could be because we cant afford to take it to a shop or even have a shop run a diagnostic on it at this point.
Considering my husband is stumped by it and usually he is realllly good at fixing our vehicles (I have a blazer as well thats a 95) im concerned that the problem could be quite serious but more so costly to the point we wont be able to get it fixed. Thank u so much for ur help and I truely hope you can give me an idea of whats goin on.
Thursday, December 19th, 2019 AT 3:05 PM