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Posted on Jan 02, 2017
SOURCE: car will not say running
You may have a bad fuel pump, First thing is to change the fuel filter since that's the cheaper of the two and you can find the filter under the driver's side inside frame rail.
Once that's been changed and you still have the problem then it's a good chance that it's your fuel pump has gone bad. Try doing a fuel pressure test and there should be a think 44 psi at idle, but please dubble check that it is 44 psi for your blazer.
Good luck and the fuel pump is in the gas tank, if your going to have to change the fuel pump, don't forget to change the wire harness from the frame rail to the pump since you have it apart. The harness is only $12.00 and that's a good investment if the wries are getting brittle and a broken wire will get you to drop the tank again.
Posted on Apr 19, 2009
when you first turn the key on you should hear the fuel pump run for about 10 seconds . this primes the fuel system .If you do not hear the pump run then you need to check the circuits for the pump
the fuel pump has a fuse and a relay that is use to power up the pump . you should check the fuse and if they are ok then switch the fuel pump relay with a like one in the fuse box (horn relay is the same as the fuel pump relay ) I think the fuse and the relay are both in the under hood fuse box on your truck . If these all check out ok then you need to check for power and ground at the fuel pump connector . if this checks out all good then replace the fuel pump . some times if you think the pump is not working you can bang on the gas tank with a rubber mallet this may move the pump winding off of the dead spot and the truck will start ... but this is not a fix .. just a way to get it started to move it or take it to a shop
Posted on Apr 07, 2011
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