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Old 05-24-2008, 02:00 AM   #1 (permalink)
DAM88
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Dual Tanks & gas vs. diesel fuel pickups

Happy holiday weekend - I hope everyone enjoys as much as they can.

I received a donor truck with dual gas tanks. I know by reading LMC catalog, that the diesel fuel pickup costs considerably more than a gas one. This will be the secondary tank. Anyone done this already (I'm sure)?
  1. My question is can a gas dual tank be used as is (if the pickup functions) or do I really need a diesel fuel pickup/float assembly?
  1. Anybody have the 83-86 Chevy/GM FSM (factory shop manual) with the dual tank parts list, pipe routing and the wiring diagram in a soft (electronic) version I can get?
I'll obviously need a secondary inline lift pump but what else? - this seems too easy . . .

Thanks,

David
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Old 05-24-2008, 10:48 AM   #2 (permalink)
yachtcare
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It may not necessarily be your cup of tea, but a way to make it even simpler......Just use the second tank as a slip tank. Using the existing sending unit(Gas) rig a line with an electric pump to empty into the vent line on the existing main diesel tank. All that will be needed is one switch on the dash to activate the electric pump. When your gauge starts reading low fuel, just flip the switch, and you have in flight refueling. This saves buying extra parts, wiring, additional sending unit(you need a return line properly routed to the fuel tank youre using at any given time, which is incorporated into the sending unit)
I recently added an additional 20 gal capacity to my '94 using a 1970's vintage in cab tank mounted on the rear wall of the cab. Works like a charm....Just a thought.
Wiring diagram can be found in a Haynes manual at the local FLAPS
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Last edited by yachtcare; 05-24-2008 at 11:08 AM.
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Old 05-24-2008, 01:58 PM   #3 (permalink)
DAM88
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That's a great idea except I will be running WVO/SVO in the secondary tank and would like to be able to switch over "in flight" to the oil and then back to diesel for parking - hence the full "factory" installation.

So will a gasoline pickup/float assembly work with oil/diesel or what's the difference between the two(besides the price)?

David

Last edited by DAM88; 05-24-2008 at 01:59 PM.
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Old 05-24-2008, 02:27 PM   #4 (permalink)
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it should work as long as it has the return line, most do. diesel pick up has a sock in it in case diesel gels, and i think some have a water sensor If i recall correct.
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well to make your pump retarded, you could let it hang out with me for a day
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Old 05-24-2008, 03:49 PM   #5 (permalink)
yachtcare
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I think if the gasser sending unit has a return line, it is likely a later model truck, that would have TBI on the gasser. Not sure, do they have the fuel pump mounted to the sender in the tank? Don't know if that would cause a problem. Might want to fill in your signature line with what year truck is your diesel, and tell us about the donor truck. Helps to know what we're working with....
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Latest accquisition(1/18/08)...'94 Chevy crew cab dually 4X4 6.5TD "F"/4L80E, 4.10 gears, Snorklectomy, Vac pumpectomy, Warpspeed crossover, 3" downpipe, 3" straight pipe exhaust dumped ahead of rear wheels, Homemade TM, Faze boost gage, New 34583 FSD on huge heat sink in nostrils, Racor R20S(2 micron)fuel/water separator before lift pump, 2x0 battery cables/grounds, Pass side battery relocated to driver side .......more to come
HAVE 1970 GMC swb 1/2 ton getting a 6.2 now!

HAD 1968 Chevy C 10 swb 1/2 ton
1961 Chevy Apache 10
1990 Chevy RV on G chassis
1982 C 30 dually 6.2L "J" with sm465, Dana 70, 3.73 w Detroit locker
1988 G 30 Van (school bus) 6.2L "J" built 700R4
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Old 05-24-2008, 06:39 PM   #6 (permalink)
High Sierra 2500
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As noted above, the pickup will work assuming that it has a return line in addition to a pickup (not an in-tank electric pump, a plain pickup tube - you can use the in-tank electric pump too actually, but you'd need a pressure regulator).
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Old 05-25-2008, 12:19 PM   #7 (permalink)
DAM88
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So my understanding is that I can use the donor truck factory dual tank setup with the gasser fuel pickup and all the factory wiring (should have all the return lines, etc.).

I'll just modify it to be like a diesel dual tank factory setup short of the diesel pickup/water sensor/sock puppet screen. My objective is to get as close to factory as possible (I'll need another 3/8" gigantic military fuel tank skid plate) and then add extra fuel filters and water separator like several of you have done (Caterpillar filters as I recall) and a small hydrogen generator.

Does anyone know where I can get the FSM (factory service manual) preferably in an electronic format (paper would work too)?

Thanks,

David
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Old 05-25-2008, 01:19 PM   #8 (permalink)
High Sierra 2500
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Don't know about a factory manual, but if you look in the FAQs there is a PDF version of the military manual for the 6.2/6.5 available for free download.
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Old 05-25-2008, 04:39 PM   #9 (permalink)
DAM88
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Thanks - I have that manual. What I'm looking for is the FSM that will show the dual gas tank setup, fuel line routing, wiring and switches - all the chassis stuff.

I can trace them through the truck but I'd like to know how the factory setup the diesel vs. the gasser tanks (if any differences).

I'm going to keep it as close to original as possible (although as far as I can tell the military never had dual gas tanks on any of the M1008, M1028 or M1031 series of trucks).

Thanks again - David
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1984 Chevrolet M1028 Shelter Carrier, 6.2 J - code diesel, bone stock 25K mileage, CARC 383 green
1986 M1031 - 6.2J, on board air & 12KW genset (in progress)
1985 M1010 6.2J - no bed 26K mileage
1986 M1009 6.2J - converted to 12volt
1986 M1008 & 1985 GMC 3/4 dual tank parts trucks
1969 AMX 390 auto 77K
1969 AMX 401 4spd 54K
1968 AMX - soon to be 6.2 J-code supercharged grocery getter
1986 Jeep J10 FSJ Pickup 360 (my first new "car")
1968 M715 Jeep Brush Fire Truck (with yelp & wail siren)
1969 M149c USMC 300gallon Water Buffalo
1968 M416 1/4 trailer Desert Tan
4 bicycles
4 dogs
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Old 05-25-2008, 04:59 PM   #10 (permalink)
High Sierra 2500
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The fuel line routing is pretty simple. Your single tank arrangement probably has most of the stuff already. Two steel lines that run along the frame rail and go up to the engine... Right about where the cab and bed separate is where the tank switch goes, then there's a couple curved steel lines about a foot long to each tank, then rubber connecting to the tank.

The wiring for the tank switch etc. is a little more complex. Somewhere around here I have a manual for installing one of those switches, along with a wiring diagram for the tank switch/fuel gauge. I will see if I can find it and scan it in.
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