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Open Roads Forum  >  Tow Vehicles

 > Auxiliary fuel tank and gravity vs electronic pump

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Sport45

Not far enough from Houston, TX

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Posted: 03/25/22 09:41pm Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

I can see how that would work. OTOH, the valve in toilet starts to leak, water drains thru the overflow, overfills bowl, and down drain. Can waste a lot of water but that is the only harm unless you have to pay a plumber to replace it.
A similar system is the float/needle seat system in a carburetor. When that leaks gas can get on top of engine, but it also dumps into the engine stops it from running right (if at all). Fuel pump stops putting gas to carb. Fire is a possibility, but most likely expense is carb rebuild.
What happens if you park the truck with a leaking float valve.
BTW, in my lifetime I have replaced over 100 toilet tank valves, and rebuilt even more carburetors. Failure is not a far-fetched idea.


If it's overflowing I'll likely smell the diesel when I get out of the truck, notice the spots of fuel blown up on the back of the truck (yes, I know what a fluid leak does to a moving vehicle) or see the puddle under the truck. Just like other failures I've dealt with I'll close the manual valve until I get a chance to repair or replace the float valve. I won't be losing any sleep waiting for the failure to happen though.


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JRscooby

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Posted: 03/26/22 05:08am Link  |  Quote  |  Print  |  Notify Moderator

Sport45 wrote:

JRscooby wrote:

I can see how that would work. OTOH, the valve in toilet starts to leak, water drains thru the overflow, overfills bowl, and down drain. Can waste a lot of water but that is the only harm unless you have to pay a plumber to replace it.
A similar system is the float/needle seat system in a carburetor. When that leaks gas can get on top of engine, but it also dumps into the engine stops it from running right (if at all). Fuel pump stops putting gas to carb. Fire is a possibility, but most likely expense is carb rebuild.
What happens if you park the truck with a leaking float valve.
BTW, in my lifetime I have replaced over 100 toilet tank valves, and rebuilt even more carburetors. Failure is not a far-fetched idea.


If it's overflowing I'll likely smell the diesel when I get out of the truck, notice the spots of fuel blown up on the back of the truck (yes, I know what a fluid leak does to a moving vehicle) or see the puddle under the truck. Just like other failures I've dealt with I'll close the manual valve until I get a chance to repair or replace the float valve. I won't be losing any sleep waiting for the failure to happen though.


I'm sure if you where near the vehicle you would notice the leak. But I sometimes turn my donkey to my pickup, don't look at it for hours. Park over night, with it dripping a quart a hour, would not make you popular in any campground.
I would think a valve that shuts off with ING switch would be a real good idea.

Grit dog

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Posted: 03/26/22 08:20am Link  |  Quote  |  Print  |  Notify Moderator

Scooby, thanks for the personal stories. But a simple check valve on the filler hose above the inlet for the aux valve tank ( just like the simple “kits” that have been for sale forever) and a requisite valve at the slip tank just works.
Regardless of all the introspection and “theories.”


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R12RTee

Full Timing with a home base in FL

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Posted: 03/27/22 08:04am Link  |  Quote  |  Print  |  Notify Moderator

I have a 40 gallon RDS tank with gravity feed. I have a manual shut off valve and also a electric solenoid that controls the flow. The electric valve has a switch in cab and is wired to a "ignition on" circuit so it closes when the truck is shut off or the switch is in off position. The valve I use is this one I bought at Amazon.
Link for valve at Amazon

3/8" NPT Electric Auxiliary Aux Fuel Tank Valve for Trucks Diesel Gasoline 12-Volt DC EHCOSMART COIL


2021 DRV Mobile Suites 38RSSA
2021 Ram 6.7 HO

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