Shops, Barns, Varmints, and Trucks - Fuel tank selector valve…………..

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Fuel tank selector valve…………..

Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=208904
Printed Date: 13 Nov 2025 at 3:24pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Fuel tank selector valve…………..

Posted By: Lars(wi)
Subject: Fuel tank selector valve…………..
Date Posted: 13 Nov 2025 at 6:27am

Acted up the other day on the ‘91 F-350 7.3L IDI. For a day, was drawing fuel from both tanks. This following about 6 weeks adding a small bottle 2-cycle oil at every fill-up to aid with pump lubrication while pulling that heavy camper across the country.
My question is; is the 2-cycle oil being added to diesel cause the pistons in the selector valve to get ‘sticky’ and possibly ‘hang up’?

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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Replies:

Posted By: DMiller
Date Posted: 13 Nov 2025 at 7:00am

Two Cycle Oil is not meant for Diesels, may be a lubricant in two stroke engines, is actually too Viscous even diluted for Fuel Injection Systems. Same issues were found using filtered Waste Engine oils to fuels as a Extender and to consume the waste.

Simple Answer Yes.

BTW, significant add on, for those adding ATF to fuel tanks for Lubricity, is perfectly fine on OFF Road machines, for on Highway is NOT as the materials in ATF can foul all manner of Emissions devices if have not been dealt with, as well using previous version that are RED, the chances of being caught as use of AG Diesel on Hwy. becomes more prevalent. Friend of ours had 'Treated' his Home Tank of ON Hwy Diesel with ATF, delivering agent noted was RED in Color and cautioned to deaf ears, was a Spot Check at a Grain delivery site and he was TICKETED for Dyed Fuel, truck was placed OOS until the Fuel supply was fully cleaned and cleared. And NO, there is NO test that can confirm was Not AG Fuel. ALL Diesel comes from same truckloads, Dye is added as Complete AG tank Fillings.

Posted By: PaulB
Date Posted: 13 Nov 2025 at 7:27am

If anyone wishes to a a lubricant to Diesel fuel, especially ON Highway fuel, They should use a product specifically for ON Highway fuel such as PowerService injector cleaner. This is the only product that is made by a diesel engine company. There is also a comparable Standyne product made by a Diesel injection products company. These products are "water clear" and won't be an issue when spot checked, which any diesel vehicle driven on the highway is subject to. Oils of any kind could have enough dye of any color that would be detectable in a test. Anything else I'd consider to be snake oils or homebrews which may work just fine for some and create big problems for others. I would also only use the above products in OFF ROAD fuels as homebrews are like playing Russian Roulette.

Having been a bulk transporter of fuel for many years starting before the introduction of ULSD, I have encountered first hand the complaints from those that tried to save a penny with their own homebrews for lubication when the sulfur started to be removed from diesel fuel.

However anyone is welcome to use whatever they like, DO YOU FEEL LUCKY?

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: Lars(wi)
Date Posted: 13 Nov 2025 at 7:33am

I chose the 2-cycle oil as hopefully finding a pump lubricant that is also designed to ‘burn, unlike atf or used engine oil that is not intended to ignite. I will give it a couple fill-ups without adding anything and see if the issue clears itself.

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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.

Posted By: Lars(wi)
Date Posted: 13 Nov 2025 at 7:50am

I remember when ‘dyed’ off-road fuel concept first it the market. Some was red, some was blue, the blue diesel didn’t last long because of the potential of being mistaken for aviation fuel, that was(at the time tinted blue). Some loading facilities were slow to install the dye injection equipment at the racks, so we had to splash blend the dye. At first we could add the fuel at the customers tank, then we had loading facility personnel witness us dumping the dye in the compartments of the tankers at the facility. The fun times.

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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.