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Open Roads Forum  >  Class C Motorhomes

 > Routing of Seneca(Duramax) fuel system

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fzust

Tempe, AZ

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Posted: 07/13/12 09:42am Link  |  Print  |  Notify Moderator

I posted about the limp mode issue and I tried out this "Just answer" pay for answer service. The RV technician advised filling the Fuel filter with transfluid to clean out the lifting pump. He agreed with many that the fuel filter is most likely to blame but they always put transfluid in the fuel filter to clean the pump.

Does the Duramax route fuel up to the fuel filter THEN the pump or is the pump in the tank?

Thanks,

Fred

ScottG

Bothell Wa.

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Posted: 07/13/12 09:46am Link  |  Print  |  Notify Moderator

What year? Many DA's didn't have lift pumps - not sure about the newest ones. And if they did, I can't imagine what would need to be cleaned out of one.


Scott, Grace and Wesly
2003 Dodge 3500 4x4, 6 speed Cummins (lightly bombed),
2004 Forest River 25RKS many, many mods.
POS H0NDA eu2000i

fzust

Tempe, AZ

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Posted: 07/13/12 10:35am Link  |  Print  |  Notify Moderator

ScottG wrote:

What year? Many DA's didn't have lift pumps - not sure about the newest ones. And if they did, I can't imagine what would need to be cleaned out of one.


2006 Kodiak. I don't think it has a lift pump, rather it is one pump on the top.

ScottG

Bothell Wa.

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Posted: 07/13/12 12:02pm Link  |  Print  |  Notify Moderator

Oh so your talking about the high pressure pump? I wouldn't want to run anything foreign through it. Clearances in the pump are too tight for anything thick in viscosity to get through without possible damage. The injectors are easy to carbon up with something like oil. HP pumps and injectors are just too costly to replace and too few shops can accurately diagnose problems with them.
I would just replaced the fuel filter before trying anything more invasive.

wolfe10

Texas

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Posted: 07/13/12 12:23pm Link  |  Print  |  Notify Moderator

Ya, ATF was a trick used in the OLD days on older design engines. Like Scott, I would only use clean diesel and prime according to engine manufacturer's instructions.


Brett Wolfe
1997 Safari Sahara 3540
EX: 1993 Foretravel 36' U-240


FMCA Forum: www.community.fmca.com/index

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ronfisherman

SE Michigan

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Posted: 07/13/12 03:29pm Link  |  Print  |  Notify Moderator

The Duramax has a CP3 High Pressure Pump that sucks fuel from fuel tank through fuel filter. A leak can cause air to get into the system. You will not see any fuel leak. Because fuel is being sucked from tank.
Have you checked primer pump on filter to see if it needs to be pumped to refill the filter. Also the bleeder screw have been known to have bad O'rings.
I would never run anything through a CP3 High Pressure Pump other than fuel.


2004 Gulf Stream Endura 6340 D/A
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2012 Chevy Captiva Toad
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