Question about 2004 Chevrolet Blazer
I have a fuel related problem the engine just cut out and will not start. A AA mechanic spayed fuel into the air intake and it started for 3seconds of which he said it is a fuel problem. I have looked for fuel pumps on the net. but it keeps telling me that I have more than one pump. How do I know which one it is ???
First off, the AA mechanic that sprayed fuel into your intake to determine it is a fuel issue ONLY has determined that! It is a fuel issue! Fuel is delivered to the engine by your pump(s), then it is delivered into the combustion chambers by the injectors. So, what you need to do first is a test your fuel pressure! Most vehicles has a fuel check valve so you can hook a fuel pump tester up to see what the pressure is, some don't and you have to break into the fuel line to hook up the tester. If your getting good pressure 45-60lbs from the pump(s) then the problem is not the pump(s) it is going to be a issue with the injectors.
Now, I'm not saying the injectors are bad, they would have to be tested with a noid light to make sure they are getting a signal to fire. You have to go through a process of elimination to determine exactly what the issue is, it very well could be a pump issue or an electrical issue. Even if there is no fuel pressure from the pump, you then need to check to make sure the pump(s) is getting power. Hope this helps you. Oh, and as far as the fuel pumps, you are going to have 1 in the fuel tank(s). Follow the fuel line from there and if it has another pump you will find it. I'm not familiar with this model so I can't say for sure if it does have 2 pumps or not.
Posted on Nov 26, 2013
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Posted on Jan 02, 2017
SOURCE: starts but wont stay running
In reply: if its not the maf there are 2 relays in the relay box i belive its underhood, 1 primes the fuelline to 32psi the second kicks in after it starts, and keeps it running and varies the psi. if the primer relay isnt kicking in then it wont start due to no fuel
Posted on Jul 30, 2008
SOURCE: my truck will not start.
I have had similar problems and had to replace the fuel pressure regulator. It's a major expense because it sets below the diaphram in the intake manifold. Ask your mechanic about it, it may be the issue. I would get about 30,000 miles between replacement, I've replace it 3 times since purchasing the 2000 chevy blazer new, first one was under warranty.
Posted on Mar 21, 2009
If the oil pressure switch has two wires on it it may be one that shuts down the pump. I'm not positive but I think it completes a ground circuit, not the hot side though (but may run through a relay.) There should be a pump relay under the hood with a group of other relays. I don't have a wiring diagram for your car but you can get a basic diagram in most inexpensive manuals. They wont usually give you locations but at least you can get an idea of how the system works. There usually is a fuse. If the fuse block is not labeled, use a test light and probe the back of every fuse for power with the key on (takes about ten minutes and faster than trying to find info) change any that are blown. The most likely culprit is a relay, so after testing fuses look for it. (usually on drivers fender or on right side near firewall.) Worst case, trace the power lead all the way through the harness 'till you find where power begins.Testing is important here...I could give you much better info if I was there to do it for you. Most important is to stay "on track" till you find the place where power ends. Don't jump all over the place or you will end up doing an incomplete test.
Posted on Jun 17, 2009
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