Concerning amount of rust in fuel system - Competition Diesel.Com

Red Sleeper · 07-05-2017, 07:33 AM

I changed the oil and fuel filter in my 91 12v a few weeks back. This maintenance is performed every 6 months due to speedometer not working and miles don't register. Noticed the top of my old fuel filter looked rusty. Cut the filter in half and there seems to be a fair amount of rust inside.

The filter is obviously doing its job. The rust feels like old foam that instantly crumbles when you touch it. Truck runs fine.

What has me puzzled is the truck has a plastic fuel tank, yet lots of rust has been trapped in the filter. I fill up at the same station, same pump, same everything, about 95% of the time. Same for when I had my TDI Jetta and for my 05 CR. Neither of those vehicles ever showed rust in the fuel filter.

Only thing I can conclude is the truck had rusty fuel pumped into the tank in its previous life. Which was usually red off-road diesel from a gravity fed tank with spin on filter inline, from what I know.

95cummins5.9 · 07-05-2017, 07:52 AM

Looks like algae? Maybe I'm wrong.

*Snedge* · 07-05-2017, 10:02 AM

Ugly. The tank is fiber, but if you look at the insert on top for fuel and feed and return I believe it metal.

camarokiller · 07-05-2017, 10:08 AM

Definitely have a water issue. I second algae

Red Sleeper · 07-05-2017, 05:54 PM

Quote:

Originally Posted by Snedge

Ugly. The tank is fiber, but if you look at the insert on top for fuel and feed and return I believe it metal.

Correct. Fill neck, supply and return are metal.

I'm just not convinced it's algae.

07-05-2017, 07:33 AM	#1
Red Sleeper Name: Red Sleeper Title: Too Much Time Status: Not Here Join Date: Aug 2009 Location: Lone Star State Member`s Gallery Posts: 4,595	Concerning amount of rust in fuel system I changed the oil and fuel filter in my 91 12v a few weeks back. This maintenance is performed every 6 months due to speedometer not working and miles don't register. Noticed the top of my old fuel filter looked rusty. Cut the filter in half and there seems to be a fair amount of rust inside. The filter is obviously doing its job. The rust feels like old foam that instantly crumbles when you touch it. Truck runs fine. What has me puzzled is the truck has a plastic fuel tank, yet lots of rust has been trapped in the filter. I fill up at the same station, same pump, same everything, about 95% of the time. Same for when I had my TDI Jetta and for my 05 CR. Neither of those vehicles ever showed rust in the fuel filter. Only thing I can conclude is the truck had rusty fuel pumped into the tank in its previous life. Which was usually red off-road diesel from a gravity fed tank with spin on filter inline, from what I know. __________________ Nick J '14 Silverado LTZ 5.3 4wd '05 Cummins QCSB 4wd 48re '91 Cummins w350 5spd

07-05-2017, 10:08 AM	#4
camarokiller Name: camarokiller Title: Too Much Time Status: Not Here Join Date: Jun 2012 Location: south of pittsburgh Member`s Gallery Posts: 747	Definitely have a water issue. I second algae __________________ UMWA Local 1702 1995 RCSB 2WD wh1c/47rh-4k and 60# springs-fuel system by me- low and slow

07-05-2017, 07:52 AM	#2
95cummins5.9 Name: 95cummins5.9 Title: Old man *** gossiper Status: Not Here Join Date: Jun 2012 Location: U.S.A Member`s Gallery Posts:** 4,720	Looks like algae? Maybe I'm wrong.

07-05-2017, 10:02 AM	#3
Snedge Name: Snedge Title: Comp Diesel Sponsor Status: Not Here Join Date: Sep 2006 Location: Western Pa. Member`s Gallery Posts: 18,859	Ugly. The tank is fiber, but if you look at the insert on top for fuel and feed and return I believe it metal.