Please help an ignorant 6.2 owner

[delawitt]

Yep Military hummers started with 6.2 in the early 80's and by the early 90's 6.5 also the heavier models have 6.5 w/turbo. All are still in use and easy to work on. I don't think the military would spend the money for a DURAMAX when the 6.2 and 6.5 get the job done just fine. I will however say the turbo makes all the difference in the world to this engine.

[ocoee]

Sorry for the delay in response I had to reload from a virus. Beware of AntiVermin

I keep finding things in this truck that don't make sense.
It's going to be sometime around saturday before I can get to the repair work.

Today I found a fuel pump that looks like a typical crank driven gas engine pump but it has no lines running to it.
It has the fitting but nothing is connected or disconnected.

If I post photos of the engine would you be able to ID the things that are confusing me?

[JMD]

Just my opinion, but I think that your injection pmp may be going (gone?) out. I would like to think that those old "roosa-master" pumps are kinda cheap by now. The instalation is easy, and I even watched a GM tech rebuild one once, i only took about an hour and it looked kinda easy!

[JMD]

Originally Posted by ocoee

Today I found a fuel pump that looks like a typical crank driven gas engine pump but it has no lines running to it.
It has the fitting but nothing is connected or disconnected.

I did not see this post before my last response to you. After reading this, I kind of think that maybe someone bypassed the stock mechanical fuel pump and installed an electric one, if this is the case the electric one might be broken.

You might try tracing the fuel line backwards from the injection pump, (it is right in the middle of the engine) back towards the fuel tank. My money is on you finding an in line electric fuel pump somewhere in there, and I bet it is not working anymore.

Good luck!!

[ocoee]

I have been studying for a test that I probably wont pass and it's way cold so I haven't done any more looking

But looking it up and finding out that this is the standard pump I was thinking that there was an upgrade to electrical.

if the problem is the electric fuel pump
Is there an advantage staying with electric instead on returning to stock

[ocoee]

Ok electric pump is pumping
I blew the old filter out with an airgun, fuel that cam out was clean and clear.
Reinstalled filter and bled the system.still no go

Disconnected the the fuel line at the outlet from the filter and there was a strong steady flow of fuel

Any other suggestions

Do I need to bleed the lines at the injectors or is it just time to break down and buy the manual or an injector pump

[JMD]

I would at first take a test light and make sure you are getting power to the injection pump solenoid. I think it is a bright orange wire. It should go on and off with the key.

If good, I would open the line that goes into the injection pump from the fuel tank, and briefly turn the key on. Your electric fuel pump should expell fuel from the open line.

If checks out I would loosen a couple of the "top" fuel lines at the injection pump and see if fuel is expelled when you roll the engine over. At this point be aware if air is escaping from the open lines, but be carefull this is high presure fuel, it can be dangerous especially if you put body parts directly over or directly in the path of the "squirting" high presure fuel, (it can be injected under your skin, big problem).

If you are getting air out of these lines I would tighten the lines at the pump, and loosen the lines at each injector, turn the motor over until all of the air is expelled. (the "surging" that you mentioned can be symptom air in the lines)
If fuel or air does not come out of these lines, I am prone to believe that your injection pump is broken.

I am checking some links now on rebuilt pumps, I will post back here in a few min.

[JMD]

http://store.realdiesel.com/gmch6inpu.html

http://www.o-f-i.com/index.php?pid=1...INJECTON_PUMPS

Check out these links, there are many, many, links that end up on e-bay. With a little shopping I think you could do better.

Make sure you get the instalation kit, as this will have some wear parts for the pump drive. The second link has new pumps for your instalation, the rebuilt units are further down the page. Also, it looks like they have some pumps for "heavy duty" applications, this might give your truck a little more get go.

[ocoee]

I did some checking earlier and found the real diesel site.
I was hoping that they were decent

It's getting dark and I have to take a test tomorrow I'll have to check those things Wednesday

I did not mention that I removed the wire going to the pump and can hear a clicking that I assume is a solenoid

also did not mention that the electric pump never shuts off. I can hear it change tones when I bleed the filter or relieve the pressure at the lines but it keeps running.
Anyway I'm flooding it. Can you even do that with a diesel ?

I'm going to have to go the cheapest route right now

[JMD]

Originally Posted by ocoee

I did some checking earlier and found the real diesel site.
I was hoping that they were decent

It's getting dark and I have to take a test tomorrow I'll have to check those things Wednesday

I did not mention that I removed the wire going to the pump and can hear a clicking that I assume is a solenoid

also did not mention that the electric pump never shuts off. I can hear it change tones when I bleed the filter or relieve the pressure at the lines but it keeps running.
Anyway I'm flooding it. Can you even do that with a diesel ?

I'm going to have to go the cheapest route right now

It is possible to "flood" a diesel but it is unlikely unless your glow plugs are not working right, and since they were aparantly working before they are probably good now.

As far as expense goes, I saw a used pump on e-bay yesterday with a bid of $75.00 with 13 min to go.

Good Luck!!