Question about 1999 GMC Suburban
Have 1995,3/4 ton,Chev diesel,6.5 engine. Diesel dies at highway speeds. It just starts to surge and I must pull over. Engine starts and warms up ok. At low speeds everything is ok. Changed fuel filters, twice, just pulled off air filter and no change. Had fuel pump on engine checked and at idle it is putting out 1800 lbs of pressure. Anyone out there had a problem like this and how did you solve it. Tks, Richard.
Posted by Anonymous on
Pump pressure is too low
should be around the 22,000 psi mark needed to crack the injectors
indicates that the there is a fuel supply problem to the pump or pressure regulation from the pump
Posted on Jul 22, 2017
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Posted on Jan 02, 2017
I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.
Posted on Jan 05, 2009
This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.
Posted on Apr 17, 2009
SOURCE: i am doing repairs on
better chec the wiring or connections 1st--pull the plug from the pump and inspect for flaws and corrosion then plug back in--pump itself can be tested--the fuel injection pump in engine area may have issues
Posted on Feb 28, 2011
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