Why is my Duramax diesel engine not starting?

I have seen more leaks causing no starts, loss of prime and low fuel rail pressure codes from poor fitting aftermarket fuel filters use Delco only. Remember when dealing with power loss and fuel pressure issues the duramax has no in- tank or frame mount fuel pump pushing fuel to the engine.

Why is my Duramax fuel rail pressure so low?

This is a very common problem that we hear about from our Duramax customers. Actual fuel rail pressure is not keeping up with desired fuel rail pressure. This may only happen in high fuel demand situations like towing or racing but it can also happen with everyday use.

Where does the fuel leak go on a Duramax?

Fuel leaks on a duramax are almost always on the return side of the system, the smaller of the two fuel lines traveling down the frame rail, going to the fuel cooler and back to the tank. They can leak at the cloth covered rubber return lines at the injectors, these lines can only be replaced in sets left and right side, they are expensive.

What are the features of a Duramax high pressure fuel system?

Your Duramax high-pressure fuel system relies on several electronic components and sensors for proper operation. The Fuel Temperature Sensor can commonly throw codes and effect engine performance if it has failed. Features: Stock Replacement 13 Month Unlimited Mileage Warranty Replaces OE Part #: 97224993 Bostech Old Part#: ISK949

Where is the fuel pump located in a Duramax Diesel?

The mechanical h.p. pump located in the engine valley is the only pump, it has the duel function of pulling fuel from all the way from the tank and thru the filter and cooling the ficm to the h.p. section of the pump. This means the entire fuel line, tank to engine, is under suction YOU WONT SEE A LEAK , you might see a wet stain.

How much power does a Duramax Diesel have?

Power was at an all-time high coming in at 397hp and 765 pounds of torque, and in order to provide this much power while still keeping pollutants low, GM needed to be able to increase the pressure in the fuel system to levels above what the tried-and-true CP3 could safely deliver.

What are the most common LMM Duramax engine problems?

1 DPF system & active regeneration 2 Leaking transmission lines 3 Fueling / low fuel pressure 4 Piston / crankshaft failure 5 Allison 1000 power limitation

What kind of engine is in a 2008 Duramax?

Good luck! I have a 2008 Chevy 2500 dura ax diesel 6.6 – Ali’s. Trans z-71 shortbed. No oil leaks, great fuel mileage pull 40 ft raptor with 3 can am atv 201,000 mi. Engine light comes on, all vitals ok .

Are there problems with the Duramax Diesel 6.6L?

Have not had problems with injectors, but have had problem with the fuel line that go’s around the turbo housing,failing I have 27,800 miles on my stock 08 LMM. The only thing the dealer has repaired is a defective water sensor. I’m currently looking at one.

What is the low fuel pressure code on a Duramax LBZ?

Duramax LBZ and LMM P0087 Low Fuel Pressure code Summer comes, temps rise, and the working trucks with relatively high miles start to set a P0087 code and go into limp mode while towing.

Why is my Duramax diesel engine not working?

The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.

Are there any problems with the Commons 6.6L Duramax Diesel?

Common Problems with the 6.6L Duramax Diesel. The 6.6L Duramax has been in production since 2001 and has proved, on a large scale, to be a relatively reliable and durable platform. While various versions of the engine have surfaced over the years, all generations of the Duramax are based on the same foundation.

Which is the best 6.6 Duramax engine to buy?

Just like the LBZ was the best pre-emissions 6.6 Duramax engine, the L5P is the best post-emissions Duramax. All the problems associated with emissions system and injection pump have been taken care of, and for 2017 GM switched suppliers of the injection pump from Bosch to Denso.

Do you need adii for GMC Duramax 06?

You don’t have to get a ADII because the 06 doesnt have the injector issues the LB7’s do. You could get a liftpump without filters, like the Kennedy pump, or Holley pump, or Raptor… Stay away from PPE their pump is junk.

When did the Duramax 6.6L turbo diesel come out?

The Duramax 6.6L V8 turbo-diesel engine is nearing its 20th year of production, after debuting in 2001. Over the engine’s lifespan it has gone through 6 different engine variations: LB7, LLY, LBZ, LMM, LML, and L5P.

Which is the best diesel engine for Duramax?

One of the most reliable and most power-capable Duramax’s made, the LBZ will continue to be the diesel enthusiasts Duramax of choice. The LMM is virtually the same engine as the LBZ with more emissions control. The LMM features a diesel particulate filter (DPF), an oxidation catalyst, and a more savvy EGR.

How much horsepower does a Duramax LML have?

The LML Duramax took a big performance leap to nearly 400hp and to 765lb-ft. of torque. To accommodate for the power increases, Duramax strengthened the block, pistons, rods, main bearing, and a higher flowing fuel pump.

Why does my diesel truck not start up?

Read on another thread where the truck would not start,turned out to be cps,dealer said a couple bolts backed out and fell into the pan. First- these trucks do not have a fuel pump- the CP3 pulls fuel from the tank and then pressurized by the CP3 pump to the injectors.

Are there any problems with the Duramax fuel pump?

It can also be relatively difficult to prime the fuel system once air has been introduced into the system, such as when the fuel filter is changed. The 2001 to 2004 LB7 fuel filter housings seem to be the most prone to problems. Water pump failures for Duramax engine are somewhat common.

What to do if your Duramax injector is not working?

To relieve this problem, the wiring harness (or affected portion of the harness) will need to be replaced/repaired. Often, you can verify the problem by wiggling the wires around the injector. If the problem goes away (even momentarily), you’ve identified the affected zone.

How much VAC does a diesel engine need?

If I pinch the rubber line at the filter housing, the line coming from the tank, vac goes up to 11 to 12″ of vac, then the engine died. Question is, to reach this higher vac, it took 30 to 45 seconds, wasn’t quick.

Where does the vacuum go in a diesel tank?

Tough spot to see, being right at the corner of the tank, and on the topside. Vacuum did increase to 3″ up from 2″ after a good cleaning of the sending unit, and hose replacement.

Why is my diesel VAC reading so low?

If the vac readings I’m getting are low, I have 2 thoughts, air leak at one of the quick connect points, or after reading, the CP3 suction side is going. Truck has 130K miles, injectors changed at 50K and 88K, never have a loosing prime, or hard starting, no smoke at idle.

What to do about intermittent shifting in fuel vacuum?

Have replaced hoses at filter head, rebuilt filter head, new FPR, rubber lines between hard lines (found hoses kinked) and more, thrown parts at it. All this if to find the cause of my intermittent shifting issues, which gets better with a fuel line fix of some sort, kinked rubber hose.

Can a 6.6L Duramax crank no start?

Hi I could really use a tip if you could help. I am working on a 2006 6.6 duramax and can’t get it to run. Drove ina couple months ago but ran very poor like a missfire. then stopped running completly. Will start on starting fluid but then stalls when runs out of starting fluid.

What causes fuel starvation in a Duramax Diesel?

Fuel Starvation and/or Air in the Fuel Lines. The Duramax diesel is susceptible to fuel starvation and getting air in the fuel lines. This can be contributed to the fuel filter housing design and the fact that the Duramax does not use a lift pump. Rather, the high pressure fuel pump (injection pump) is responsible for vacuuming fuel from the tank.

Why does my Duramax Diesel keep cutting out?

. The Duramax diesel is susceptible to fuel starvation and getting air in the fuel lines. This can be contributed to the fuel filter housing design and the fact that the Duramax does not use a lift pump. Rather, the high pressure fuel pump (injection pump) is responsible for vacuuming fuel from the tank.

What should I do if my fuel pump is not working?

Fuel pump breakers usually have a button on top that pops up when it trips. Simply push this button back in until it clicks. Check the owner’s manual for the exact location. Fuel Pump Testing – If the fuse is good and the circuit breaker is not tripped; then the engine is not getting fuel pressure.

Why is my fuel primer pump not working?

Sometimes you will replace a fuel filter and will be unable to prime the system,you will pump the primer on the fuel manager (fancy G.M.term for filter housing) until youre dead. This is either because you are out of fuel, you have a rotted line or the primer pump is bad. G.M. sells a kit to repair the pump .

Can a GMC Sierra run without a fuel pump?

Without gas your Sierra will not run at all. With that in mind, most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s).

What to do if your fuel pump is not working?

If nothing after that, then the fuel pressure regulator is not working and needs replacing. If you get pressure to the rail, then there could be a problem with the injectors; they may be either dirty or plugged up. Take the injectors off the engine and clean them with CLR.

Why is there no fuel in the tank?

I replaced the fuel pump, fuel filter, and tank selector switch, but still no fuel. Other possible causes of your lack of fuel issue could be the fuel injectors or an electrical problem. If the fuel injector fuse (s) are blown due to a wiring issue, this may cause your problem.

Fairly common issue when you overtighten the sensor while doing a filter change. The fuel leak you saw also allows it to suck air into the system, causing a loss of prime. It’s easier for the engine to suck air through the leak than to suck fuel from the tank. Make sure your fuel/air leak is fixed.

Why does my 2015 Duramax high country not start?

I have a 2015 2500 High Country with 45k Miles. I was in line at a drive through and the lady asked me to turn off my engine cause she couldn’t understand my order. I did and when i tried to start it back just turns over but wont start. Pushed it to a parking place and notice diesel coming from the fuel filter where the water seperator screws in.

Is the GMC Duramax compatible with diesel fuel?

The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel fuel.

Why does my GMC diesel engine not work?

American diesel fuel is thinner than its European counterpart, allowing for air pockets that cause the metal to rub against metal and create shavings. “The pump secretly deposits metal shavings and debris throughout the fuel injection system and the engine until it suddenly and catastrophically fails without warning,” the lawsuit alleges.

Can a Duramax engine crank but won’t start?

Drove home 5 miles. came out several hours later, engine cranks normally but won’t fire. Held throttle down and it started. Had slight surging. Very slight. Drove 5 miles, had dinner, came out, crank but no start. Held throttle down and still no start.

Can a Duramax 6.6 start without a fuel pump?

My son has a 2011 duramax 6.6 that will not start on fuel but will start with a shot of either and runs like a top. He has replaced the fuel pump, … read more Vocational, Technical or Tra… Vocational, Technical or Tra… Vocational, Technical or Tra… I was low on fuel and drove to station to get more but never ran out.

Is there a lift pump on the 15 Duramax?

I was thinking that they did not add a lift pump until the brand new L5Ps. In the past GM has called the tank module a fuel pump, but there actually was not a pump there, just the pickup assembly. I remember they made some fuel system changes in 15.5, but I thought the lift pump was added for 17?????

What causes a Duramax injection pump to fail?

As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.

Why is my Duramax not starting after fuel filter change?

Changed the fuel filter today, and cannot for the life of me get the system primed back up. I loosened the bleeder screw, and have been pumping for so long that there’s a blister on my hand.

Why did my 2004 Duramax engine not start?

My 2004 Duramax started and then died like it was out of fuel. Now it won’t start. I have about 1/4 tank of fuel, tried priming it until the batteries died.

Do you need a lift pump for a Duramax?

They suck, you can have someone crank the engine while you hover over the bleeder screw. Or pour diesel into the filter directly. But even doing that you’ll still need to prime it good. Lift pump my friend…a lift pump will be your friend someday.

What’s the number on the glow plug on Duramax?

The only code showing up is a number three glow plug, but that code has shown up on and off for a while, and shouldn’t make it impossible to start. Clicking this will make more experts see the question and we will remind you when it gets answered.

Why is my Duramax diesel engine not starting?