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Old 03-25-2005, 06:42 PM   #1 (permalink)
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Gravity feed for RDS fuel tanks

I have been evaluating inbed fuel tanks for my new 2005 F350 Powerstroke. I discussed the setup from Northern Tools with the factory at RDS. The technical guy I talked with recommended that they have a new gravity feed installation that has some special valve that will not allow the OEM tank to overfill. He took quite a bit of time to describe the installation and I must admit it sounded very interesting. The cost for the gravity feed kit was $60 dollars plus UPS shipping. Does anyone have any information about the RDS fuel tanks quality? Has anyone heard of this kit RDS is starting to sell?
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Old 03-25-2005, 10:18 PM   #2 (permalink)
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Re: Gravity feed for RDS fuel tanks

I have a 90 gal. tool/fuel combo made by RDS. I bought it new and installed it in the fall of 2000. I was very dissapointed in it for several reasons.

The fuel pickup was mounted in the front left corner. This caused it to suck air when the tank was still 2/3 full going up a 4 percent grade. RDS told me to bring it by (900 miles from home) or ship it to them at my expense and they would inspect it. Both of the options were unacceptable to me so I fixed it by installing my own homemade pickup.

There was no tank vent. I fixed this by installing a rollover safe vent from American Tank and Toolbox.

I am now happy with this tank after all the work I did on it. I don't believe I saved much money compared to buying one from a name brand tank supplier since I also had to purchase a level sender, vent, and installation kit.

RDS did recommend to me that I just put in a gravity feed to the factory tank (they didn't have this new valve that you mention back then). I am not comfortable with this idea since everything I have read says that a gravity feed is not legal.

If you find out that their gravity feed with the special valve is actually D.O.T. legal (I wouldn't advise taking RDS word for it) please respond because I would be interested in it also.

Jeff
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Old 03-25-2005, 10:53 PM   #3 (permalink)
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Re: Gravity feed for RDS fuel tanks

Ive seen and have talked to drivers that have them most are dodges, Ill stick with my electric pump auto cut off.fills faster and I need the potty break,
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Old 03-26-2005, 07:22 AM   #4 (permalink)
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Re: Gravity feed for RDS fuel tanks

I just purchased a RDS 60 gal. tank/tool box combo from Northern tool. [ QUOTE ]
The fuel pickup was mounted in the front left corner.

There was no tank vent. I fixed this by installing a rollover safe vent from American Tank and Toolbox.



[/ QUOTE ]

Alot of the above mentioned problems are fixed. The tank now has a roll over valve/vent. The pick up is in the center of the tank, along with return, it also has a gauge in it now. The gauge is in the tool box section.

I'm gravity feeding my front tank for now. I'm evaluating this idea. I didn't buy RDS's set up. I just installed a manual shut off, along with a 12 volt valve from NAPA. It appears to be working fine so far. Hope this helps, Carl.
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Old 03-26-2005, 09:48 PM   #5 (permalink)
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Re: Gravity feed for RDS fuel tanks

ccolby,

Thanks for that reply. It's good to hear that they have fixed these problems.

Jeff
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Old 03-27-2006, 08:44 PM   #6 (permalink)
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Re: Gravity feed for RDS fuel tanks

I have a 96 psd f250 and was wondering if an aux. tank can be plumbed in the main fuel line ahead of where the dual tanks come together?
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Old 03-28-2006, 06:41 AM   #7 (permalink)
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Re: Gravity feed for RDS fuel tanks

I have the RDS 90 gallon aux fuel tank 72118 and the RDS gravity feed kit installed in my '06 PSD.

The tank was a pain to install due to it's 60" width and the clearances needed for the 3/4" to 3/8" fitting. The drain is on the right hand side of the tank, yet the fuel fill for the PSD is on the left; go figure.

The tank has a vent with a roll-over valve in it. The gravity feed system works very well. I have mine plumbed through a 3 micron Wix 33005 WS fuel filter with a McMaster-Carr 400 psi SS ball valve at the drain point on the tank. All fuel for my truck now goes through the aux fuel tank and the 3 micron filter before going into the main tank. The first time I filled the aux fuel tank, with only 50 gallons, it took about 2 hours to fill the main tank from just above quarter full.

The gravity feed system has a roll-over valve in it that prevents the main tank from overfilling. The downside is that the main fuel tank sees a full tank for +200 miles and the truck computer throws a code saying you have a bad fuel quantity sensor. This just happened to me last Saturday and I'm still waiting for the tank gauge to go down so I can confirm and clear the code.

Gravity feed legality: Go read 49 CFR 393.65 and decide for yourself. It's pretty clear, despite their best attempts to make it unclear. Also read 49 CFR 393.67c5 for drain fittings. For diesel, it appears that gravity feed is legal, at least for DOT.

Good luck.

Al


ETA: All DOT regulations can be read and downloaded at the www.gpo.gov site, select "GPO Access", then "Online Resources" and then click on the "Code of Federal Regulations" link, then go down to "49" which is the DOT section.

Al
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