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My CUCV spin on fuel filter mod

Matt S

Active member
Steel Soldiers Supporter
142
35
28
Location
Los Angeles, CA
Duramax Fuel Filter installed and up running. Line size @ filter is closer to 1/2 inch but fresh 3/8" line will stretch into place over the Duramax inlet & outlet. I do have the fuel heater wired up using new DIY weather pack connectors. I have not wired up the water separator yet as I wish to modify the Duramax design to retain the CUCV 3rd wire / bulb check function.
Did you figure out the wiring for the WIF sensor?
 

Matt S

Active member
Steel Soldiers Supporter
142
35
28
Location
Los Angeles, CA
Duramax Fuel Filter installed and up running. Line size @ filter is closer to 1/2 inch but fresh 3/8" line will stretch into place over the Duramax inlet & outlet. I do have the fuel heater wired up using new DIY weather pack connectors. I have not wired up the water separator yet as I wish to modify the Duramax design to retain the CUCV 3rd wire / bulb check function.
Keep me away from the matches!!!!

I've had 2 different filter heads like this in the truck over the past few months. I can't get them to not leak...and I'm being nice with the term leak. They are pounding out diesel. Way worse than the stock one I removed. I even tried a rebuild kit on one but it only progressively got worse.

I'm need to find another alternative. I was hoping to keep a fuel heater but I might get something that wraps around the filter itself and is separate.
 

Whitfield

Member
116
5
18
Location
Richmond Virginia
Keep me away from the matches!!!!

I've had 2 different filter heads like this in the truck over the past few months. I can't get them to not leak...and I'm being nice with the term leak. They are pounding out diesel. Way worse than the stock one I removed. I even tried a rebuild kit on one but it only progressively got worse.

I'm need to find another alternative. I was hoping to keep a fuel heater but I might get something that wraps around the filter itself and is separate.
Where did you source these from? If they are defective from the manufacturer is there no resolution? Mine is still going strong but I have heard of a few duramax guys finding a bad batch of filter heads. I tried to source a GM part to avoid this issue - but with most everything made in the far east now sometimes even OE can be a roll if the dice.
 

Matt S

Active member
Steel Soldiers Supporter
142
35
28
Location
Los Angeles, CA
Where did you source these from? If they are defective from the manufacturer is there no resolution? Mine is still going strong but I have heard of a few duramax guys finding a bad batch of filter heads. I tried to source a GM part to avoid this issue - but with most everything made in the far east now sometimes even OE can be a roll if the dice.
A mix of sources. I bought one from ebay and another off Amazon. I bought the rebuild kit off Amazon. It was ok after the rebuild but now it is so bad I won't start it. I'm surprised it has enough fuel pressure to run.

I might try the Napa style next. I'd like a Racor but I'm not having good luck finding those. I would like a fuel heater but I don't need a water in fuel sensor.
 

GunnyM1009

Well-known member
354
529
93
Location
Roanoke/Alabama
Doing this conversion with the Napa 4770 base this weekend. Thanks to the OP and everyone else who has contributed to this thread. I'm fitting out my M1009 for trail riding and the spin ons are a much easier filter to find locally if something goes wrong in the woods.
 

Matt S

Active member
Steel Soldiers Supporter
142
35
28
Location
Los Angeles, CA
A mix of sources. I bought one from ebay and another off Amazon. I bought the rebuild kit off Amazon. It was ok after the rebuild but now it is so bad I won't start it. I'm surprised it has enough fuel pressure to run.

I might try the Napa style next. I'd like a Racor but I'm not having good luck finding those. I would like a fuel heater but I don't need a water in fuel sensor.
UPDATE - I went with a Racor 445R with fuel heater. It cost more than the Duramax filter set up (but not by much when I ordered 2 sets of filters and bases) but it has been in the truck for a few months.

I think the Duramax filters might have worked for me if I re-routed fuel filter before the lift pump but I didn't want to mess with that. I didn't order the WIF light but I have a clear bowl to see the fuel. Also I've never had a WIF light come on in over 25 yrs of owning and driving diesel trucks.
 

firefox

General
Steel Soldiers Supporter
1,845
51
48
Location
Berkeley CA
I suspect that the WIF stuff was put in there because the military has this tendency to cross rivers without using a bridge....
 

Tyler benkowski

New member
4
5
3
Location
Brooklyn CT
Duramax Fuel Filter installed and up running. Line size @ filter is closer to 1/2 inch but fresh 3/8" line will stretch into place over the Duramax inlet & outlet. I do have the fuel heater wired up using new DIY weather pack connectors. I have not wired up the water separator yet as I wish to modify the Duramax design to retain the CUCV 3rd wire / bulb check function.
great writup with pics and information. I too am going to be doing the Duramax spin on conversation. I ordered some diy weather pack connectors.for the fuel heaters, Would you be able to tell me what color wires on the filter coincide with the original wires from the box style filter setup? Thankyou!
 

Rennat_2006

New member
20
16
3
Location
Idaho
Just did the dmax filter conversion myself and was hoping someone had updated this thread with the electrical hookups. Whitfield and others have you guys got these hooked up? Im gonna go look in the manuals for wiring diagrams
 

Matt S

Active member
Steel Soldiers Supporter
142
35
28
Location
Los Angeles, CA
I just clipped the and spliced the wires from the original filter to the new one. That way the truck side was the same.
 

vanaisa

Well-known member
251
339
63
Location
Tallinn, Estonia
Just did the dmax filter conversion myself and was hoping someone had updated this thread with the electrical hookups. Whitfield and others have you guys got these hooked up? Im gonna go look in the manuals for wiring diagrams
Look here - post nr.5

 

BenderIsGreat

New member
6
2
3
Location
USA
It's good to see people still working on this mod!

The truck has 3 wires to the original water in fuel sensor. The duramax filter bottom has 2 wires. I haven't found the actual harness wiring for the WIF in the TM's yet... Trying to keep the WIF light working if I can.

Or at least know which of the two wires I need to connect to. Maybe the factory wiring has +V, GND, sensor return?
 

combatmonkeywrench

New member
1
0
1
Location
Maryland
It's good to see people still working on this mod!

The truck has 3 wires to the original water in fuel sensor. The duramax filter bottom has 2 wires. I haven't found the actual harness wiring for the WIF in the TM's yet... Trying to keep the WIF light working if I can.

Or at least know which of the two wires I need to connect to. Maybe the factory wiring has +V, GND, sensor return?
im doing this mod, looks like its been a few years since anyone rogered up regarding wiring. Any updates on wIrving?
 
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