This morning after running my truck, shutting off the ignition and then restarting 5 minutes later it stumbled on the restart and SES light appeared. Truck ran sluggish but got me to the Auto parts store where I used their OBDII code reader and pulled P251 Injection Pump Cam System. Truck started and ran fine from parts store to work, SES light still on. I opened the tee handle drain valve and had a stream of fuel flowing out hose and no hesitation or cut out in the motor. That leads me to believe it is the OPS. Am I correct in this assumption?? When I turn key on and wait for the Wait to Start light to go out, I can hear the pump run, like always. Hope this makes sense and any insight would be greatly appreciated. I read the FAQ's and KnKreb's thread on OPS and LP's but I am still a bit confused. What is the best course of action to take?? Or is this an IP problem?? (Hope Not)

The OPS carries juice to the lift pump. If the lift pump is running, the OPS is likely OK.

The 251 is the optic sensor which basically means it is time for a new pump. Let me know if I can help with the pump. JK

JK,
Thanks. What is your part number and how much does it run??

Budroe

If you're still under 120,000 miles, you may be a candidate for a new pump from GM under warranty.

The extended warranty for electronic fuel injection pump is 11 years or 120,000 miles, whichever comes first...

Good luck

You said "may be" a candidate. What would qualify me (or disqualify) me from being a candidate? Are there some things I need to do to prep the truck for inspection at the Stealer??

Budroe

By "may be" I mean mostly depends on the mileage of your truck, which I don't know. You're way under 11 years obviously, but if over 120,000 miles you don't qualify.

You have to prove to the dealer that you have a defective injection pump, your code P251 should be evidence of that.

It is also conventional wisdon to arrive at the dealer with a clean fuel filter and filter bowl, so as to not have them claim dirty fuel, water etc. may have been the cause.

They will see the code, and hear you complain about sluggish running and so on.

Warranty is as per GM special policy, number 00064, there's a copy of it in a thread on here somewhere.

Bob, here is a copy of the letter I found on one of your old posts. However in does NOT include 1999. I called the stealer to make sure it was under warranty and he had no clue what I was talking about the 11yr/120k mile deal. He is asking for something specific from Gm that gives the details of this warranty. Do you or anyone know where I can get an official copy of the warranty on the IP? I sure need it cause Im looking at a helluva repair bill if I cant get him documentation.

Dear General Motors Customer:

As the owner of a 1994-1998 Chevrolet C/K Pickup, Tahoe, Suburban, Chevy Van/Express or P model truck; or GMC Sierra, Yukon, Suburban, Savanna or P model truck, equipped with a 6.5 litre diesel engine, your satisfaction with our product is very important to us. Your vehicle was provided with a new vehicle warranty, which covers certain parts of your vehicle for a specified period. These warranties are of considerable value to you if you should experience problems with your vehicle.

This letter is intended to make you aware that some 1994-1998 Chevrolet C/K Pickup, Tahoe, Suburban, Chevy Van/Express or P model trucks; or GMC Sierra, Yukon, Suburban, Savanna or P model trucks, equipped with a 6.5 litre diesel engine, may develop a failure of the electronic fuel injection pump.

To address the above mentioned condition, General Motors is providing owners with special warranty coverage. If this condition occurs on your 1994-1998 Chevrolet C/K Pickup, Tahoe, Suburban, Chevy Van/Express or P model truck; or GMC Sierra, Yukon, Suburban, Savanna or P model truck within eleven (11) years of the date your vehicle was originally placed in service or 193,000km (120,000 miles), whichever occurs first, the condition will be repaired for you at no charge. Damage from poor quality or incorrect grade diesel fuel, and gasoline or water contamination, is not covered under the terms of the 6.5L diesel warranty. This special policy applies ONLY to electronic diesel fuel injection pump repairs and/or replacement as a result of injection pump failure.

This is not a recall campaign. Do not take your vehicle to your GM dealer as a result of this letter unless you believe that your vehicle has the condition as described above.

If you have already paid for some or all of the cost to have the electronic diesel fuel injection pump repaired or replaced and the in-service time and mileage were less than eleven (11) years and 193,000km (120,000 miles), you should contact your dealer for reimbursement consideration. Please provide your dealer with your original paid receipts or invoices verifying the repair, the amount charged, proof of payment, the date of payment of those charges, and proof of ownership of the vehicle at the time of the repair. Your request for reimbursement, including the information and documentation mentioned above, must be received by your dealer by September 30, 2001.

If the work was done by a Stanadyne dealer or other service establishment other than a GM dealership, you may not be eligible for reimbursement. Your dealer will review the case with the General Motors representative for reimbursement consideration. The amount of reimbursement will generally be limited to the amount that the repair would have cost GM to have it completed by a GM dealership.

Repairs and adjustments qualifying under this special coverage must be performed by a GM dealer. You may want to call the service department at the dealership to find out how long they will need to have your vehicle so that you may schedule the appointment at a time that is convenient for you. This will also allow your dealer to order parts if they are not already in stock. Keep this letter with your other important glovebox literature for future reference.

Customer Support Department
General Motors of Canada Limited

00064

You should probably contact GM customer support to find out the nitty gritty.

So far as I know, this applies to years beyond 1998, but I think 1998 was the first year of the policy after most of the earlier pumps were having problems.

No, they fixed my 96 also twice

Does a 1998 Tahoe with a 350 instead of a diesel engine have a lift pump as well?

Does a 1998 Tahoe with a 350 instead of a diesel engine have a lift pump as well?

No, on gassers the pump is in the tank.

On the same vehicle, is the wiring the same, as in the fuel pump relay only operating the fuel pump when cranking and when oil pressure is built up, the OPS takes over for supplying power to the fuel pump?