thank you for your advice, i have thought about it and i'm going to go through with heavy equipment. your advice helped me a lot, thank you.
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Hey Rob,

Just reading over your post and I have a few things I was wondering if you could answer to help narrow this down. You run a bosh CP3 mechanical pump so unlike in a car cycling the key won't build fuel pressure in the rail. Now what could be happing is as you said the check valve on the return could be failing, you would notice hard starts and poor performance but cycling the key should have no effect. You said you have 7V at your injectors when the misfire was going on if this is the case then that could indicate a problem. Just want to make sure that I am not miss understanding and you only have a voltage of 7 at half your injectors. If so is it all one side of the motor or are you getting 7 volts of both banks.
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Going to need a little more information. What codes are you getting? Are there any other symptoms (loss of communication, no oil pressure at IPC, intermittent no crank, intermittent crank - no start, etc...)? There are multiple TSB associated with some of the symptoms you are describing.
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You have to decide what you are capable of doing. Both of the trades you are tying to decide between require a lot of aptitude and dedication to be able to be successful. Training will only take you so far and open so many doors, but if you are always second guessing yourself and wondering if you made the correct choice, you will always view your life and your job as second best.

What you may need to do is talk to some councillors at colleges or high schools, maybe take some aptitude tests to determine if you are even suitable for striving for a trade. It ain't easy. And it does require dedication, lot's of dedication. It's entirely possible you could receive training in either or both and gain your creditation. But would you be able to drag yourself out of bed every day when you don't like your JOB because you don't view it as a CAREER.

On the other hand, there is a demand for mechanics with electrical skills, and demand for electricians with mechanical skills. Maybe you should not choose between the two trades. Go for broke.
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I don't think diesel powered anything is going to go away anytime soon or in the foreseeable future. You will see stricter and stricter emissions imposed upon the diesel industry as a whole. Which will result in very sophisticated emission control systems and even more sophisticated electronic engine controls. Which do breakdown and will require a skilled mechanic to inspect, diagnose, repair and service. They haven't made a computer or a robot that can replace mechanics. It still requires a human factor (intuition, experience, etc...). With the worldwide demand for resources and goods, the diesel industry will only grow and create more opportunities. They will eventually develop alternatively powered engines that may compete or eventually replace diesel powered engines, but being a mechanic means continuously learning new skills as the industry changes and evolves. As long as you stay current you should always have a job.
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The fuel injection pump at the front of the engine valley is the high pressure fuel pump driven by the camshaft gear (mechanical). This pump is supplied by the low pressure fuel pump in the fuel tank (via the fuel filter). High pressure fuel is regulated by the fuel pressure regulator mounted on the fuel injection pump (which is controlled by the ECM). Fuel is delivered to the right and left fuel reails via high pressure metal lines, ultimately to the fuel injectors (which are electronically controlled). Excess pressure is relieved by the fuel pressure relief valve located on the left fuel rail. Excess pressure is returned to the fuel tank via the fuel cooler.
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i'm going to school this year for heavy equipment technician, but i have been wondering what do you think the future of diesel is gonna be like? and what will the future be like for techs? i just don't want to get into a career that could one day be obsolete. what do you think?
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Am in search of an overhaul power shuttle kit for a Case 580B backhoe. Twin clutch model. Am Located in Ottawa On Can.   ...

tkks i guess i should have asked what or how many components control the 2500 psi that is needed in the fuel rail for the injectors to work properly.
thks for your reply jordan any help with this would be great.
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on a 2007 gmc pk with 6.6 duramax is there a type of pulse width modual or controler or a pressure control for the fuel rail to control the piezo solinoids on the injectors.or is it just controled by sending unit pressure which the engine ecu controls
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thanks for your advice, i'm still debating between electrician or heavy equipment, there very different i know but i originally wanted to be an electrician but changed my mind because i thought i might like the transportation sector more but now i'm having second thoughts about it. the main thing i wanted to avoid as my career is one that will leave me crippled by 50 lol.
what would you say is a better career to go for?
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Not sure if you have fixed the problem yet but if it is a -6 loader with piston pump for steering the problem is the steering pump will not return to minimum angle inneutral position causing a horrible overheat there is a campaign for this as described komatsu wheel loaders motly rely on hydraulic tank for cooling the dash -6 loaders have a small hyd cooler on the fan motor return this is just to take care of the heat generated from the motor(fan motor that is)
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