Loss of power

[Lbzsquid]

So I left my truck sit for about 4 days and came back to it it started then died couple seconds after so I pumped the fuel filter released the air then started it again idles fine but when I went to accelerate it was like I wasn’t even touching the pedal I’m new to diesels so I’m not sure what the issue could be. Also have a leak that looks like oil but everytime I check it it’s full like it should me. If anyone could help I’d muchly appreciate it

 

[Will L.]

The hand primer pump seals fail. Install the rebuild kit for it and you will be good to go.
Real basic mechanical skills and tools - easy job. Just start out by cleaning all around it with can of brake cleaner so you don’t get dirt in there.
Youtube search will bring up multiple videos showing how to do it better than we can type a how to

 

[Lbzsquid]

The hand primer pump seals fail. Install the rebuild kit for it and you will be good to go.
Real basic mechanical skills and tools - easy job. Just start out by cleaning all around it with can of brake cleaner so you don’t get dirt in there.
Youtube search will bring up multiple videos showing how to do it better than we can type a how to

Thank you I appreciate it!

 

[jrsavoie]

I'd also install a lift pump

 

[dbrannon79]

If my thinking is right (most of the time it's not) there should be a lift pump in the tank on this model. make sure it's working and providing decent pressure. IDK what the spec is for it though.

 

[Lbzsquid]

All it was was a bad fuel filter I think the bottom wear the wire is connected failed thankfully I had a spare not quite sure on if there is a lifter pump I plan on installing one if there isn’t I’m still doing my research on her

 

[dbrannon79]

Glad to hear you found the problem. it's always a good day when it turns out to be a simple fix

 

[Rockabillyrat]

Duramax didn't get a lift pump until the L5P. They are prone to air intrusion issues in the fuel system. My first recommendation to any Duramax owner is to install a Fass or Air dog system and delete the factory fuel filter.

 

[Will L.]

Duramax didn't get a lift pump until the L5P. They are prone to air intrusion issues in the fuel system. My first recommendation to any Duramax owner is to install a Fass or Air dog system and delete the factory fuel filter.

100%!

 

[jrsavoie]

Duramax didn't get a lift pump until the L5P. They are prone to air intrusion issues in the fuel system. My first recommendation to any Duramax owner is to install a Fass or Air dog system and delete the factory fuel filter.

You never know what's what on a used vehicle. The previous owner may have taken care of that.
Best for newbies - or anyone else to verify.

It's like trust the code to know your gear ratio. You never know for sure until it's verified

 

[Rockabillyrat]

You never know what's what on a used vehicle. The previous owner may have taken care of that.
Best for newbies - or anyone else to verify.

It's like trust the code to know your gear ratio. You never know for sure until it's verified

Its normally very obvious if a lift pump has been installed on a duramax because you will hear it with the key on. And in this case it would have leaked fuel out the WIF sensor o ring.

 

[Odlaw]

All it was was a bad fuel filter I think the bottom wear the wire is connected failed thankfully I had a spare not quite sure on if there is a lifter pump I plan on installing one if there isn’t I’m still doing my research on her

Check out the Black Market Performance Cat Fuel Filter Lift Pump for $335.00



It is easy to install and has a CAT commercial grade pump mounted right on top that is easily replaceable as it is a standard lift pump on a lot of CAT heavy equipment. It pumps 95 GPH or roughly 1.6 gal per minute, plenty of fuel and a lot cheaper that the complete dual filter lift pump setups you see mounted on the frame rail hanging out from under the bed on a lot of trucks. I've been running one for almost 2 years now after I got tired of rebuilding that stupid fuel filter head. I've been driving an old ford ranger gasser back in forth to work for the last year to combat Potato Brain Bidens high diesel prices so several times my Dmax has sat for 2-3 weeks between starts and she fires right up every time.

 

[MrMarty51]

Check out the Black Market Performance Cat Fuel Filter Lift Pump for $335.00
View attachment 85388


It is easy to install and has a CAT commercial grade pump mounted right on top that is easily replaceable as it is a standard lift pump on a lot of CAT heavy equipment. It pumps 95 GPH or roughly 1.6 gal per minute, plenty of fuel and a lot cheaper that the complete dual filter lift pump setups you see mounted on the frame rail hanging out from under the bed on a lot of trucks. I've been running one for almost 2 years now after I got tired of rebuilding that stupid fuel filter head. I've been driving an old ford ranger gasser back in forth to work for the last year to combat Potato Brain Bidens high diesel prices so several times my Dmax has sat for 2-3 weeks between starts and she fires right up every time.

What is the pressure rating on this system ?
Asking for a friend with a 6.5.