My o5 Dodge Ram 2500 with 5.9 Cummins is hydro locking. Fuel is the culprit. Injectors have been tested and are good. Any ideas?

Asked by Oct 05, 2016 at 12:42 AM about the 2005 Dodge Ram 2500

Question type: Maintenance & Repair

Injectors tested out good, and they only several years old. Engine will idle but
when you give any fuel it starts knocking then locks up.
Anybody out there have any ideas, as I live on an Island in Southeast Alaska
and the few mechanics here have no experiance with a problem of this sort
other than start replacing stuff till it is fixed.

5 Answers

The 2001 Cummings had a really bad problem with the transfer fuel pump going bad. It is the auxiliary pump that supplies fuel to the injection pump, and it is relatively cheap to replace. I think this will be a good place for you to start checking.

7,845

It's cheaper to buy a fuel pressure tester and check fuel pressure before u go throwing parts at it by guessing. If pressure is above 35psi, the problem is not fuel related, could be a plugged catalytic or no spark. Check each one at a time

The problem is the engine is getting to much fuel because the injector on my Cummins diesel is dumping excessive fuel into the cylinder and because of the high compression ratio will lock engine up because it will not compress the excessive fuel. And till compression is manually relieved,by turning the flywheel till valve opens will not turn over because of the hydro lock. Ideas?

hmm. not sure on that engine. but on some the injectors have to be synced to the computer. I had a similar problem and had to relearn the injector addresses. engine will start and idle but does crazy things when you rev it. I put a lab scope on the injectors and it showed up right away.

other than that I would look at fuel pressure and sensor values. You will need a good scanner to see things like high pressure fuel pressure. it is 1500 psi to start and 4000 to 23,000 psi. running...so be careful. Some engines are as high as 39,000 psi now.

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