horses4hd

I have a frequent occurance that the engine goes into protect mode.
- 1900 rpm max
- Computer indication is massive fuel leak( Loss of fuel pressure )
Careful inspection reveals no fuel leaks.
Vehicle mileage is 152,000- all eight injectors changed at 125,000.

Vehicle pulls well until computers indication of the problem.
When the problem occurs I am driving up hill 4-5% grade.
engine is usually 1800-2200 rpm.
This climb must be significant length 1/2 mile or more.

The fuel pressure sensor/computer has been changed and GMC service has spent 3 days looking for the problem.

The last service inspection diagnosis was that air was entering at the filter. The truck did the same thing again less than 1/2 mile after it was "fixed" and returned to me.

Does anyone have experience with this kind of trouble?

Midnight Tech

Welcome to TSF and our garage horses4hd!
Just a bit curious...did they do a fuel pressure test on it (both static and under load)?

arlenekeith

Hi,
We have a 2002 duramax diesel p/u that has loss of fuel pressure when the engine is shut off. The vehicle needs to be primed before it will start. Fuel pressure tests have been done, no leaks have been found. also just replaced all injectors. Vehicle still needs to be primed...any ideas why?

Volt-Schwibe

i'm curious, how full is the tank when this is happening? i've seen a similar condition when someone lived on a really steep hill, their gmc truck would do exactly that same thing when coming up the hill to the house. turned out, nothing can avoid it other than having more than 1/2 tank of gas while coming up the hill.

very drastic solution, but it's the simplest.

the only other thing i could think of to resolve it would be to add a second fuel tank, with a funnel shaped bottom, so it would get better pickup while on steep hills.

i'd try a nice steep hill, with 3/4 of a tank of fuel and see what happens.

if you already have, let me know.

Volt-Schwibe

it would probably be best for you to start a brand new thread, but that sounds to me like a pinpoint leak at the engine end of the fuel system, allowing the fuel to slowly drain out of the fuel lines, filter, and pump.

this would leave the lines completely dry and it would need priming.

however, a car that new... shouldn't be having priming issues.

anyhow, this is best saved for a new thread.

john1187

john1187

need a fix 2001 duramax check engine light on at 1900 rpms code P0093 massive fuel leak won't rev over 1900 rpms

2strokedetroit

is it chipped?

2strokedetroit

have u had the fuel filter changed lately? any codes? ive heard these duramaxes have mass air flow sensors go bad and it tells the computer its overboosting and over fueling causing to retard the amount of fuel and ahve a loss of power

markster57

the fuel filter base has had some problems in it , it has check valve in it

markster57

when duramax first came out we replaced a lot of injectors and filter base at the dealership i was working at---GM dealership--