Fuel tank issue...
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Fuel tank issue...
When I bought my 95 the rear tank filler neck was removed from the opening and tied up under the truck. I just assumed it was because the truck had a large transfer tank in the bed that was tied into the front. So I reattached everything and used a suction pump to pump the old fuel in there out. Before when switching to the rear tank just to see if it it had fuel, it'd show about 1/2 tank. So got the old junk out and refilled with about 15 gallons of new diesel.
I switched to the rear after filling it, the gauge goes WAY past full (almost back horizontal) But when the front tank is completely full it just goes to full like it's suppose to. I swapped to the rear the other day when running down the road, the gauge went past full, and a couple of miles down the road it started sputtering and running out of fuel. Switched back to the front tank and it picked up and ran fine again.
What is causing my issue in the rear tank? Sending unit failure? Selector valve failure? Not sure what else it could be and would like to have some idea before tearing into it.
Thanks guys!
I switched to the rear after filling it, the gauge goes WAY past full (almost back horizontal) But when the front tank is completely full it just goes to full like it's suppose to. I swapped to the rear the other day when running down the road, the gauge went past full, and a couple of miles down the road it started sputtering and running out of fuel. Switched back to the front tank and it picked up and ran fine again.
What is causing my issue in the rear tank? Sending unit failure? Selector valve failure? Not sure what else it could be and would like to have some idea before tearing into it.
Thanks guys!
Senior User
Joined: Jan 2008
Posts: 126
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From: HAMPTON
Also a cupple of thing go wroung with the gauges the wireing at the plug at the tank loose.bad sender,and have seen a bad Selector valve do it to. the sending unit wiring runs to s/s before it go's to the gauge.
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Yep. Sure does.
Thanks etldak. I'll need to try some of that.
Does anybody know what size pickup and return lines these trucks have?
Thanks etldak. I'll need to try some of that.
Does anybody know what size pickup and return lines these trucks have?
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Thanks Glenn. I'm going to be dropping the tank within the next week or 2. Picked up a new sending unit this weekend for cheap. Going to throw that it. Also going to do what you said with blowing the lines out.
Hopefully that'll fix the issue.
Hopefully that'll fix the issue.
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Update:
Dug into this issue today and found the problem. It seem that when the auxiliary tank was put in the bed, they completely unhooked the rear tank from the selector valve and hooked up the aux. supply/return lines in it's place. The sending unit wire was also cut in the wiring harness so the gauge would work properly when switched the the aux (rear) tank. Took some time getting everything hooked back up but finally got it done.
So far so good!! Guess I'll keep the extra sending unit and selector valve as spares just in case.
Thanks for the help guys.
Dug into this issue today and found the problem. It seem that when the auxiliary tank was put in the bed, they completely unhooked the rear tank from the selector valve and hooked up the aux. supply/return lines in it's place. The sending unit wire was also cut in the wiring harness so the gauge would work properly when switched the the aux (rear) tank. Took some time getting everything hooked back up but finally got it done.
So far so good!! Guess I'll keep the extra sending unit and selector valve as spares just in case.
Thanks for the help guys.
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Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Yeah, I've never seen an aux tank installed that way. It makes sense why they did it - 100+ gallons in the bed compared to 18 in the factory rear. But why didn't they redo it when the aux tank was removed??? I don't know. But it's right now. I'm going to be adding an aux tank in the bed too but it'll be tied into the front tank. Should ad about 50 gallons there. Plus swapping the rear tank for the 38 gal so I'll have a total on board of over 100 gallons.
Senior User
Joined: Nov 2009
Posts: 109
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From: Decatur Illinois
Im not going to compare apples to apples here but similar response from the engine. One of our 9520 4x4 tractors had an operator leave the fuel cap off and went ahead and worked ground that way allowing corn shucks and everything else into the tank. Those shucks eventually wound up in the fuel lines and plagued fuel pressure. check your fuel pressure to make certain your lines are free from debris.
Thread Starter
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Fleet Mechanic
Joined: Dec 2007
Posts: 1,766
Likes: 8
From: Hutchinson, KS
Im not going to compare apples to apples here but similar response from the engine. One of our 9520 4x4 tractors had an operator leave the fuel cap off and went ahead and worked ground that way allowing corn shucks and everything else into the tank. Those shucks eventually wound up in the fuel lines and plagued fuel pressure. check your fuel pressure to make certain your lines are free from debris.
Yeah, not cheap per fillup bot far between them. In the end of a trip, you've still spent the same amount of money on fuel. I don't like having to stop unless absolutely necessary. Traveling thru Montana and Wyoming, there can be some great distances between fuel stops. And it seems like you end up stopping early and more often cause you can't make it to the next large town with truckstop. This way, I don't have to stop ANYWHERE, unless it's to water the weeds in the ditch!
Post Fiend
Joined: Mar 2006
Posts: 7,841
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From: Vacaville, Ca
I know what you mean about getting fuel early. I am to the age though that I need to stop to water the weeds about the same time I need to fill up. It is also the same time I get another drink, which is probably why I need to water the weeds.LOL
