Fuel System Leak?

[Bridgeman]

What is up? I finally got a 90hp Edge, Juice chip - my first time out on the Hwy at the first decent grade the engine light came on and into limp mode - I disconected the chip, but the problem remains. The tech 2 says: P0093 Fuel System Large Leak Detected??? No vissible fuel leaks are present. Since reset, the engine light/limp mode seems to come on mainly in the hills?? I am in the sticks - the local dearler has no idea??

Thanks

[DmaxMaverick]

Change the fuel filter. It's probably due.

[Bridgeman]

I changed it - id did not fix it

[OC_DMAX]

Check your crankcase for diesel fuel, maybe its going there.

[More Power]

Have the dealer measure the fuel system vacuum at the test port at the front of the engine. If more than 5" of vaccum, it could set a code 0093. This is usually due to a dirty fuel filter, but a fuel line restriction or excessive vacuum in the tank could also be a contributor.

MP

[Bridgeman]

Thanks, I have been checking the crank case for oil - I think that the fluid level has risen.. meaning fuel in the crank = injector troubles??

[OC_DMAX]

If you have diesel in your crankcase, it can mean a cracked injector body or possibly a loose connection on some of the internal plumbing. Keep a close eye on it.

By the way, I could not find DTCP0093 in my service manual. Are you sure it is not DTC P1093 ? (However, there is always the possibility my manual is out of date)

I think the P1093 code gets set when max fuel pressure is needed but the fuel system is unable to get it. This can be caused by a restrictive fuel filter (as mentioned above) or injectors that are seeing their final hours of operation.

Given you have changed your fuel filter, I would bet on the injectors (and there have been more than just a few failed injectors :eek: on these trucks to report)

[ 04-14-2005, 03:48 AM: Message edited by: OC_DMAX ]

[madmatt]

Hey OC! Yeah theres a service manual update...heres part of what it has to say....

SMU - Revised DTC P0093 or DTC P1093 #03-06-04-045 - (Sep 26, 2003)
Revised DTC P0093 or DTC P1093 Diagnostic Tables
2001-2004 Chevrolet Silverado

2003-2004 Chevrolet Kodiak

2001-2004 GMC Sierra

2003-2004 GMC TopKick

with 6.6L Diesel Engine (VIN 1 - RPO LB7)

This bulletin is being issued to revise DTC P0093 (2001) and DTC P1093 (2002-2004) diagnostic tables in the Engine Controls sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.