Archived Governor Overheat?

[SGastelu]

Truck runs great for about 60 minutes. After 60 minutes truck stalls under 2000 rpms with no load(shifting or clutch depressed). Will lug down to 1100 rpms(idle) under load with no problems,will run for hours under load(thru tolls,red lights on sidewalks). Will not start for about 90 minutes(more on hotter day) After 90 minutes starts as new. During this no hot start injector pump is being supplied with 1 qt/min fuel but no fuel to injectors. The only way to restart when it stalls is drop the clutch while in a lower gear bring the rpms over 2000.



Tried the following over the last 4 months: Biocide fuel tank,fuel tank and pickup filter removed and cleaned(was clean),checked hoses in tank for leaks, 3 new fuel filters,new fuel lines from fuel tank to engine,new overflow valve,pressure checked low fuel pressure hoses on engine,removed fuel heater unit and clean primary filter in it,ran standyne fuel additive thru tank and filled fuel filter with it,shut down solenoid always in the right position. Raised idle to 1100 rpm.

 

[AKAMAC]

Try asking in the 12 valve forum, sure won't hurt. Good luck, Mike

 

[rashwor]

Sounds like a bad pump. You have the P7100, but they do go out too; just not as bad as the VP44s. Don't ask how I know.

 

[SGastelu]

bad lift pump?

hi

If it was a bad lift pump wouldnt it also die under load and not run for hours.

 

[SGastelu]

lift pump

When the truck wants to die its getting alot of fuel to the inlet of the injector pump. over 1qt/min

 

[paccool]

Just a thought here - Even tho the lift pump is providing 1 qt/min at the pump, it may not be able to provide fuel at the correct pressure. I'm assuming when you say it has 1 qt, you disconnected the fuel line and flow checked that way. I would suggest you hook up a pressure gauge to the line and see what pressure you have. Don't know what the second gens are supposed to be but the 93's are supposed to have a minimum of 3psi. There is also a procedure to check a pump for suction - calls out for a vacuum gauge to be hooked to the suction side of the lift pump. You will need to get the min reading from a manual for your truck, I don't have anything.



Hope you find the problem. This sort of stuff can get real frustrating.

 

[SGastelu]

no gauges

since the pump is getting alot of fuel and it doesnt die underload i hope the pressure is ok. That was my first idea until i checked the fuel volume. But since i dont have any gauges id rather spend the money on the governor or injector pump. But didnt get any info on rebuilding the governor. Thanks for you ideas!