You can band-aide a weak cp3 by throwing a lift pump on it.
CK5
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03 gmc duramax with 350k (BBT) transmission fun
- Thread starter ashman
- Start date
So I ran out of fuel because I'm stupid. High winds on I-70 cost me more fuel than I thought. Not really a big deal initially as i was within walking distance of Green River. However, I broke the nylon bleed screw for my fuel filter. Dammit!
Got someone on the way up from moab to bring me another... along with a few spares just in case. What a crappy design. Anybody upgraded to aluminum or brass?
https://www.oreillyauto.com/search?q=Dorman+904-112
Mostly just feeling stupid for running out in the first place.
Got someone on the way up from moab to bring me another... along with a few spares just in case. What a crappy design. Anybody upgraded to aluminum or brass?
https://www.oreillyauto.com/search?q=Dorman+904-112
Mostly just feeling stupid for running out in the first place.
They have this thing that they invented about 70 years or so ago........ called a fuel gauge. 
Aluminum ones are a popular upgrade. Personally I use a lift pump, it will prime the fuel system without pulling the plug, at least it does when I change filters. Not sure about when you run out of fuel, haven't done that since I was in my teens.
i have had a few times i had to pump them up . i hardly ever use the screw . i just pump till tight and fire up . if it dies 1 more time and she is running fine.So I ran out of fuel because I'm stupid. High winds on I-70 cost me more fuel than I thought. Not really a big deal initially as i was within walking distance of Green River. However, I broke the nylon bleed screw for my fuel filter. Dammit!
Got someone on the way up from moab to bring me another... along with a few spares just in case. What a crappy design. Anybody upgraded to aluminum or brass?
https://www.oreillyauto.com/search?q=Dorman+904-112
Mostly just feeling stupid for running out in the first place.
I mentioned the part where I was stupid, right?They have this thing that they invented about 70 years or so ago........ called a fuel gauge.
That said, the winds were insane. Normally I can do 75-80 if I feel like it, even pulling the travel trailer. Today I had to lock it out of overdrive just to maintain 60mph.
Sucked a lot of fuel.
Lift pump? I'll have to look that up.
If it happens again I'll try that, although now I have a couple extra screws, just in case.
I’ve never had a problem with the factory plastic one but I have always used a 6 point socket on it.
Your allison still being good!?
Your allison still being good!?
It's a low pressure pump that feeds fuel from the tank, up through the filter, and to the cp3 (high pressure pump).
Filter housings on the dmax are notorious for leaking air. Causing low fuel pressure, no start after sitting overnight, damage to cp3 and injectors, ect.
Adding a lift pump stops a bunch of these issues and depending on the model, can also add better filtration, always a plus.
My son put a FASS filter and pump on his '03. He has good results with it, but he did run his fuel level down to an 1/8th of a tank and it didn't want to restart. He had heard of Dodge having this issue when down to a 1/4 tank.
I told him to remember that the fuel helps cool the pumps.
@ashman , glad that you got it fixed.
I think it breaks from over tightening it. When I tried to remove it, the whole top just broke off.
The tranny has been great since I started kicking it out of overdrive on the hills. I haven't popped a code in quite awhile.
Once I get my shop finished I'll have to put a lift pump on my "to do" list.
I used the aluminum one from amazon. Its like 6 bucks if I remember correctly.
welp, It's injector time. 
Took the travel trailer down to Bryce Canyon last week and the truck was way under powered all the way down. I did replace the fuel and air filter, which helped but I was having trouble maintaining 65mph on anything but flat ground. Stopped in Beaver and had my fuel pressure checked along with a few other things and the guy said the only other culprit was the injectors. I've got an appointment Thursday morning to diagnose the injectors to see how bad they are.
Took the travel trailer down to Bryce Canyon last week and the truck was way under powered all the way down. I did replace the fuel and air filter, which helped but I was having trouble maintaining 65mph on anything but flat ground. Stopped in Beaver and had my fuel pressure checked along with a few other things and the guy said the only other culprit was the injectors. I've got an appointment Thursday morning to diagnose the injectors to see how bad they are.
welp, It's injector time.
Took the travel trailer down to Bryce Canyon last week and the truck was way under powered all the way down. I did replace the fuel and air filter, which helped but I was having trouble maintaining 65mph on anything but flat ground. Stopped in Beaver and had my fuel pressure checked along with a few other things and the guy said the only other culprit was the injectors. I've got an appointment Thursday morning to diagnose the injectors to see how bad they are.
Do feed lines too, or spend hours cleaning the old ones. Merchant auto sells a good kit with cups, injectors and lines.
Any thoughts on a rebuild kit?
http://www.wholesaleinjectors.com/product/pre-assembled-lb7-injector-kit/
http://www.wholesaleinjectors.com/product/pre-assembled-lb7-injector-kit/
Wow, that is not cheap.......
I got a quote earlier for a shop to do the whole set... $3800!
I'm hoping to find a way to do it cheaper than that.
To do it right, you want to use genuine Bosch rebuilt injectors, reseal the cups, and replace the high pressure injection lines.
Yes definitely only use new Bosch injectors and new fuel lines. My buddy did his dad's a while back. I'll ask where he got them. I haven't done a lot of Duramax work but I'd do them for you if I was closer. Doesn't look that bad just start removing things til you get down to the injectors.
This. I got my injectors for Industrial injection, as they had the best price. Ran about 1800 if I remember right. Got the washers, and install kit from merchant. I didn't do cups because all of the injectors came out without pulling the cup.
