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2005 isuzu: LOSE POWER..LOW FUEL..WE SERVICED THE TRUCK..FILTERS

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I AM WORKING ON A...
I AM WORKING ON A 2005 ISUZU NPR HD 5.2L, IT WILL RUN FINE FOR 20+ MILES THEN LOSE POWER, AFTER TURNING IT OFF THEN RESTARTING IT, IT WILL RUN FINE AGAIN FOR A SHORT TIME. THE ONLY CODE STORED IS A LOW FUEL RAIL PRESSURE CODE. WE SERVICED THE TRUCK AND CHANGED ALL FILTERS BUT THE PROBLEM IS STILL THERE. THANKS FOR ANY INSIGHT. JOHN
Submitted: 8 years ago.Category: Car
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Answered in 45 minutes by:
9/21/2009
Auto Mechanic: danny, Mechanic replied 8 years ago
danny
danny, Mechanic
Category: Car
Satisfied Customers: 5,064
Experience: Mechanic at school corp bus garage! Experience in fleet diesel and regular automotive.
Verified
If you have low fuel rail pressure it could mean a leaky injector or a bad fuel pressure regulator. Or you have a leak on your fuel rail. When warm the fuel pressure test will tell you if it is the regulator. Thanks Dan
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Customer reply replied 8 years ago
DANNY, WE UNDERSTAND WHAT COULD CAUSE A LOW FUEL PRESSURE CONDITION, WHAT WE ARE LOOKING FOR IS SOMEONE WHO MAY HAVE SEEN THIS PROBLEM AND COULD GIVE US A MOST LIKELY CAUSE. WE HAVE ACESS TO ALLDATA AND IDENTIFIX, BUT THERE IS NOTHING ON THESE TRUCKS. THE FUEL RAIL SHOWS NO LEAK, AND I WOULD THINK A LEAKING INJECTOR OR REGULATOR WOULD CAUSE THE PROBLEM PRIOR TO HAVING TO DRIVE SEVERAL MILES. IT SEEMS LIKE THE TRUCK HAS TO GET SOME COMPONET HOT BEFORE THE PROBLEM BEGINS.
Auto Mechanic: danny, Mechanic replied 8 years ago
I agree I will openthis up for another mech
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Customer reply replied 8 years ago
THANKS
Auto Mechanic: jeffrey590, ASE Master Technician replied 8 years ago
jeffrey590
jeffrey590, ASE Master Technician
Category: Car
Satisfied Customers: 2,847
Experience: ASE Master Technician , Saab Master Technician w/ 35 years Dealer Experience in Advanced Level Diag.
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Greetings borrella,   I have seen this problem before ... The vehicle I had would go only 10 miles before acting up...Same thing...shut it down and restart...OK for a while again...Turned out to be the fuel pump...as it got hotter it would bind internally and limit fuel VOLUME to the rail...Pressure was always in spec...but there wasnt enough volume getting to the rail...hope this helps...jeffrey590
jeffrey590
jeffrey590, ASE Master Technician
Category: Car
Satisfied Customers: 2,847
Experience: ASE Master Technician , Saab Master Technician w/ 35 years Dealer Experience in Advanced Level Diag.
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jeffrey590 and 87 other Car Specialists are ready to help you
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Customer reply replied 8 years ago
THIS WAS PRETTY MUCH WHAT WE EXPECTED, BUT IT WAS GOOD TO HAVE A SECOND OPINION FROM SOMEONE WITH YOUR EXPERIENCE. THANKS
Auto Mechanic: jeffrey590, ASE Master Technician replied 8 years ago
My pleasure...Thank you...jeffrey590
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jeffrey590
jeffrey590
jeffrey590, ASE Master Technician
Category: Car
Satisfied Customers: 2,847
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Experience: ASE Master Technician , Saab Master Technician w/ 35 years Dealer Experience in Advanced Level Diag.

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