If its a 98 model it should be a CPI. i'm assuming its a 98 since you have a PCM for a 98 blazer for sale lol. although i do not know much about them but am learning. i also have a 98 that had a pump go bad but replaced it and it fired right up afterwords. my best guess would be check and make sure the wires are hot if they are supposed to be.

 

I haven't gotten a fuel pressure gauge yet, nor have I tested to see which wires are hot on the injector wire harness. I'm a lazy bastard,
all I do is sit on my couch and look at asian **** all day while I spank my dead horse
I mean monkey
It's really becoming a problem I think.

The reason I'm posting again is because I have an idea about what's possibly going on, and this is the direction I'm going to go with things once I get off... my couch.

So the fuel pump going out, and it still not starting with a new one installed, are likely related somehow. It would be very coincidental for the pump to go bad and something with the injectors to take a **** at the same time.

So here's what my thoughts are.... remember that I don't have much experience, so please tell me why this isn't likely or even possible if it's not.

My fuel filter is clogged up with something, which was causing the pump to work too hard, so it died. Or maybe when it died, it took a **** into the fuel line and that's what clogged the filter. Regardless, I think it's now clogged and not allowing the right amount of fuel pressure to the injectors. The injectors somehow know this and won't open sesame. (ie. not getting pulse).

So I'm going after the fuel filter once I get up off my ***. I'll keep everyone posted. It might be a while, I pulled out the crotch rocket yesterday, it's been kinda nice outside (finally).

Thanks for the help so far.

 

What year of vehicle are you working on and what engine is it?

 

I changed the fuel filter but it still won't fire up. I was sure it was going to. When I spilled the gas out of the old filter and into my mouth, it tasted like there was a lot of dirt n stuff in there.

My friend is going to bring his fuel pressure gauge over on Wednesday so we can see what the F is going on here. Still kinda suspecting not enough fuel pressure at the injectors, as was first suggested in this thread. I didn't really think it was a possibility at first. But the more and more I read, and the deeper rooted my understanding becomes for automotive electromechanical physics, the more I thinks the fuel pump and/or the installation of said pump will be the problem.

It just doesn't seem like the pump would die and I would have a bad cam sensor (or such) simultaneously.

If the pressure turns out good, I think the next step will be to remove the manifold cover and inspect the spider/poppets. I don't believe it's a cracked spider, but I think maybe that backfire compression (from initial pouring of fuel into the intake I spoke about) may have inverted my poppets. Not really, I don't even know what a poppet is or looks like, but it sure sounds traumatic to have your poppets turned inside out. Or maybe they were melted into the engine block from the blast. Like those pictures you see of the Hiroshima aftermath where a childs sandal is fused into a piece of concrete. Or when the contents of an intact lunch pail are completely carbonized....

Oh man, how did I get off on that tangent?


Oh, before I forget. To answer the question about which version my pile of **** is:
1998 Chevy Blazer
4.3L Vortec

....with overhead cams and dual glass pack exhaust with a turbo super charger and Edlebrock magnesium inverted Hemi poppet thingies.

One more thing....
Since I have it all opened up right now, does anyone have any experience/advice about installing a hydrogen conversion fuel system? So I can run my Blazer from water?

I don't know the reality of being able to do this, but I do know I have read a few articles claiming it can be done. I also met a gentleman once who was starting up a service that installed hydrogen conversion units in cars a few years back. It seems like I would have heard more about this type of wonderful device that turns water into hydrogen and oxygen and then utilizes it as fuel for the vehicle. Maybe I'm in a cave, or just wasn't listening.

IS THIS POSSIBLE?
I want to do it.

I'll make mine run on pee, so as to dually recycle and make less polution!

 

im having the same problem with my injector system i tested the injector pack with the fuel lines in them and pressurized i jumped one injector straight from the battery and it sprayed good so that ruled out the psi problem now when i turn the ignition on with the volt meter connected to the two leads from one set of injector wires coming from the pcm it reads 12v but when i try to crank nothing reads ??? who out there can help a modest hero like myself

 

and it's only pumping up to 45 psi.

Remember that I had paid someone to install a new fuel pump in it already. However, it was a pump from eBay and it was just the pump itself, not the entire assembly. I was told that you should always replace the whole fuel pump assembly... then again, he was also trying to sell me a $315 fuel pump assembly.

So now I need to decide if I want to spend the $315 and then tackle this pain in the *** job myself, or explore other possibilities like low pump voltage or insufficient ground.

I was also going to try a few knucklehead ideas I have to test it.
Like:

- somehow pumping some air pressure into the schrader valve on the fuel rail, just enough to bring the whole line up to around 63 psi. Then rolling it over to see if it spits some gas through the injectors. Maybe it will even maintain the ~60 psi afterward?

- bypassing the fuel pump relay to leave the pump running for a few additional moments after it shuts itself off because it thinks that it has done it's job of pressurizing the fuel rail.

When I toggle the ignition on (w/o starting) a few times, it doesn't actuate the fuel pump after the first time or two. So there must be something that's telling the ECM that the fuel rail is pressurized enough and it doesn't need to kick the pump on yet. When I squirt a little fuel out of the schrader valve and try again, it will turn on. What component tells the computer what the fuel pressure is?

I'll answer my own question, the Fuel Pressure Regulator, right? Now where the F^*& is that? Do I need to remove the intake cover to get to it? i keep reading about the injectors and other parts and pieces, and then I look online for pictures of the location, and then I go outside and look at my rig and say "Hmm, I guess I don't have one of those thingys". But really I'm thinking it must all be under the manifold cover, which appears to be a daunting task of removal just to poke around at **** that i don't know if could even be causing my woes.

Maybe I shouldn't even waste my time anymore on this. By the time I figure it out, all the worlds oil is going to be floating in the ocean killing those poor sea creatures... eh, *** 'em... but I won't be able to afford any of the remaining gasoline, and I'll have to walk 10 minutes to the grocery store. NO!!!!
But there won't be any groceries there anyway... so nevermind, I won't need to go after all. This could all be a blessing for me actually. I'll get a head start on the whole reverting back to "before there were cars" thing.

Today I'll start teaching myself to hunt... cats and dogs, though. I live too far from the woods.

Then I'm going to go fetch me a cave-wife with my club.

Hopefully I won't appear to have gone insane to everyone around me, they might not understand what's going on here.

Before I head out hunting, does anyone have any ideas on my low pressure fuel pump?

 

OK for one yes a bad camshaft or crankshaft sensor will cause a no start. You were correct about the crankshaft sensor it is under the vehicle on the passenger side, your camshaft sensor is under your distributor cap and is not fun to change at all,but if one of these sensors goes bad you should have a code. How do you know you have spark have you checked and seen it for your self or did somebody tell you it was OK no disrespect but what I have read you are dealing with some backyard want to be. You need to check these thing yourself so you know excatly what you are working with. Start from the beginning check your fuel pressure and your spark you have to have the tools to do it they do not cost a lot and are a good investment. Start there then come back to the sight and let us know what you found out. A fuel pressure gauge does not cost a lot of money get one you can always use it in the future if you have a old plug laying around (Make sure the gap is the same as your vehicle) pull the spark plug wires put the plug on it have somebody turn it over look for spark if you don't have a old one pull one out it would not hurt to look at your plugs anyway. If you don't think you can do this then you will need to find a qualified Tech to check it out. Did the vehicle just quit running while you were driving it?

 

If I pour gas into the intake manifold it will start and run off that fuel only. It doesn't introduce any new fuel through the injectors and it dies after a few moments.
There's spark.

If I pee into the intake manifold, it doesn't start. I didn't expect it would, I just had too many beers. Thought you would like to know. (Just kidding, don't use this for diagnosis)

I couldn't find a fuel pressure gauge for less than $50. That's a lot of money for something that I will only need to use this once. But good ol' autozone let me borrow their very nice fuel pressure kit with a $150 deposit, which was fully refunded upon returning the tool. So here's a plug for our good friends over at autozone.

Get in the zone!
4700 W STATE ST,
BOISE, ID 83703
(208) 336-2563
http://www.autozone.com/autozone/

Watch out for that no good clerk named Joey though.
He kicked my dog and banged my girl while I was in Iraq fighting for his freedom.
Not really, I just made all that up, so as to slightly dull that autozone glamour I left.


OK, so I had a new fuel pump installed after it died on me while driving.
When it was sitting in the road and backyard mechanic #1 came to my rescue, he poured gas into the intake manifold and told me to turn it over. BOOM!!! With a great big cloud of smoke came from under the hood. I thought maybe he had killed himself. No such luck. He told me to keep cranking it, and then it started. I thought for a brief moment that he somehow fixed it with his voodoo magic, I was in awe. Then it died again. He confirmed his diagnosis of a bad fuel pump. His Dad owned a shop right up the road, and since I was about 50 miles from my home, I said OK!

So I ordered a new fuel pump off eBay. Thought I was getting a steal of a deal too. $60 plus shipping paled in comparison to the dealer's quoted price of $400 something. Well this little did I know then, that's the route I think I shoulda taken. The expensive pump is for the entire fuel pump assembly, housing and pump. The one I got was just the pump (and the wrong one 3 times!). So I think he had to hack it into the old pump housing. I have never seen or touched a fuel pump housing, so I don't know what that entails.

But after he got it all done, he said there were more problems but didn't elude to what. He actually told me that the pump pressure was good at "around 55 psi" and it "held over night". So I kinda believed him. Then came to this wonder site and was shown the light. Slowly I began to realize that the guy was full of ****. Especially when I got my autozone pressure gauge (Get in the Zone! Ya!) and discovered only 45 psi.

So now I'm stuck. It could be that he f#cked up when installing the pump, or perhaps the pump was just a piece of **** to begin with.

Maybe if I can find out what a fuel pressure regulator is, and if I have one... if it would regulate this new pump to only put out 45 psi.

I bypassed the fuel pump relay for a few moments to let the pump continue to try and build up some pressure, more than what the system was allowing it to(?). I had to return my autozone fuel pressure test kit (Get in the Zone! Ya!), so I was flying blind. It didn't work, needless to say.


SOMETHING TO NOTE*****
I noticed that when I add fuel into the top of the intake and start it up like that (remember it only runs briefly then dies again), that my RPM gauge doesn't register anything, just stays at ZERO RPM's. This kinda makes me want to go out and buy new Crank and Cam shaft sensors. One of them seems likely to be how the motors' revolutions per minute are measured. But maybe the Engine Computer Module has something in it that doesn't send a signal to the tach unless it thinks it's in a successfully started and running state, all systems go.

Maybe I should just go buy a ten speed and get on with my life.

What a fukin mess.

I'm going to go **** down the throttle body again.

Maybe take a duke too.

 

Sure sounds like a bad pump. You can get adapters to test the fuel pressure at the filter which will give you the dead-head pressure of the pump with no return to the tank. If this is not up around 60psi, the pump is bad.

I am sorry for your misfortune, but please do not let your frustrations flow over into violating the rules of the forum...