20 Most Recent 2002 Hummer H1 Questions & Answers

Dear sIR:pLEASE see the electrical-electronic diagram for ignition and proceed with common sense.

Diesel fuel doesn't go bad like gasoline, at least not as fast. I've been around diesels in construction equipment and sometime a machine will sit for a couple years and still start right up. You have other problems. I don't know that much about the Hummer diesels but, Ford uses a high pressure oil pump to fire the injectors. The main oil pump supplies oil to the high pressure oil pump reservoir and then the high pressure pump supplies oil to the injectors. If Hummer uses a similar system the reservoir may have drained down and there is no oil for the high pressure pump to pump. Ford has plug where a person can fill that reservoir manualy if necessary. Maybe try cranking it some more, don't crank it more than 10-15 seconds at a time. Walk away from it for 10 minutes or so, then try again, make sure you let the glow plugs cycle. If it don't start after a half dozen tries, you may have to have a mechanic look at it. I'm sorry I can't be more help.

Hello,

Let me guess...you need an exhaust pipe?

You can find this measurement yourself using a tape measure and maybe some help from an extra person, (if needed) to hold the tape in the center of your wheel and measure to end of frame, or mark the pavement at the center of the wheel and use it for your guide.

Different size tires can give you different measurements, but there are standard measurements! If you are still having problems, I would call your local Auto Zone or Advanced Auto, they can tell you exactly what it is, plus they both price match...which is a great benefit.

Hope this helps!

Kind regards!

This sounds more like the pump having failed. Raise the hood and check the power steering resevoir for fluid. While it's running look inside and see if there are a ton of air bubbles. That would tell me that the pump may not be pumping the proper pressure. This is not a part required by HUMMER. Your local auto parts store should carry it as it is widely used by Chevy and GMC. There are a lot of substitute parts that will save you money. I have a factory manual and parts manual if you would like them. I can be reached at [email protected] so feel free to ask me any questions as I am pretty familiar with these vehicles.

The fuel/water seperator is located under the hood, driver's side, against the firewall. Black cap and 2 wires going to the bottom. The pump uses an optical sensor so yes, if there was fuel, it would really screw with the system. However, the PMD on these were problematic. This is the control module that is mounted to the side of the injector pump. They have a kit you can purchase to get it away from high heat and will comew with the harness and all to extend it. Would you like a 2003 shop manual for this?

All Kenworth trucks are hooked up in Parallel Not series

All the ground jumpers go to negitive and all positive are the same.
Make sure all the connections are clean.

If you still need diagrams to remove the tanks, email me at [email protected] and which fuel tank?

The only fuel filter is in the fuel/water heater/sperator. If it is dying, the glow plug circuit should be checked first. The glow plug light should illuminate for around 10 seconds. The next thing I would check would be the fuel pressure going to the fuel/water seperator. Let me know what you find and if you need diagrams let me know.

There are dozens of causes for lack of starting. Take it to a mechanic.

you can drill out the plate and the floor and put in a bolt and nut,useing washers of course.i can't be more specific,i don't know what your vehicle is.

I never had a Hummer but I can tell you a couple of things to check. Make sure your fuel(every 30000 miles) and air filter are new. The other thing,my 2001 monte carlo needed a new catalitic converter at 44000 miles.It was acting like your Hummer. I had a high-flow type installed. Yours and mine are both GM,maybe they use the same type cat. Have someone push down on the gas petal while you feel the exhaust flow coming out of the tail pipe. The flow should increase as the gas petal goes down.
I hope this helps you.

Depends on your driving habits. One of the best indicaters if you have never added brake fluid is the level in your master cyclinder. Rotors: if you feel a pulsation in the brake pedal under normal breaking.