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Fuel usage math, intank pumps

 
Old 11-14-2018, 06:22 PM
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Default Fuel usage math, intank pumps

In another post I mentioned wanting to use the dual tanks in my C10-I kind of thinking toward using
an AEM 380 in each tank. 380 LPH, X 1.63=619 gallons an hour. Looking at my Holley fuel map, using
aprx 14 LBs boost, I would be using aprx 337 lbs/hr of fuel, (given fuel pressure will affect it). I found a
valve that should easily flow more than I need to switch tanks. The only thing I need to figure out is
after cutting a hole in the tank (I have a 3 1/2 x 5 1/2 flat area I can use) what I can make up to hold the
pump, and have a feed/return and seal it-something like the Tanks Inc setup, but its 6" in dia, otherwise I
would use them.
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Old 11-16-2018, 02:35 PM
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Dumb idea.

Use one main tank. If you need additional fuel capacity for longer journeys, run a pump that fills that main tank from the other.
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Old 11-16-2018, 08:11 PM
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The bad part of these trucks with dual tanks is the size. They each only hold about 15 gallons (usable). That and you have to fill each from different sides of the truck. Not an easy task at today's gas pumps. Hoses don't reach and the people start dialing the cops when you lay the nozzle on the ground to turn your truck around. I would do a large factory single saddle tank (28 gallons I think) or one between the frame rails in the rear, Pinto style lol
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Old 11-16-2018, 09:35 PM
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Originally Posted by Bad Apache View Post
The bad part of these trucks with dual tanks is the size. They each only hold about 15 gallons (usable). That and you have to fill each from different sides of the truck. Not an easy task at today's gas pumps. Hoses don't reach and the people start dialing the cops when you lay the nozzle on the ground to turn your truck around. I would do a large factory single saddle tank (28 gallons I think) or one between the frame rails in the rear, Pinto style lol
I've filled dual tanks literally 1000's of times at many different stations and never had anyone say anything or call the cops. If he's that worried about it he can always use a credit/debit card twice to fill up since it doesn't cost you anything more to do it.

Last edited by LLLosingit; 11-16-2018 at 09:42 PM.
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Old 11-17-2018, 04:34 AM
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Originally Posted by Bad Apache View Post
The bad part of these trucks with dual tanks is the size. They each only hold about 15 gallons (usable). That and you have to fill each from different sides of the truck. Not an easy task at today's gas pumps. Hoses don't reach and the people start dialing the cops when you lay the nozzle on the ground to turn your truck around. I would do a large factory single saddle tank (28 gallons I think) or one between the frame rails in the rear, Pinto style lol
Then all the more reason to have your own onboard transfer system so one tank is the main tank, and as such will also mean much less chance of fuel surge in usage.

But I would never recommend running two separate pumps from two separate tanks for the main supply to the engine. It's just asking for trouble.

if for some reason you must insist on something like that, then run two low pressure pumps to a surge tank/pumps and feed the engine from that
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Old 11-17-2018, 07:05 AM
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Originally Posted by LLLosingit View Post
I've filled dual tanks literally 1000's of times at many different stations and never had anyone say anything or call the cops. If he's that worried about it he can always use a credit/debit card twice to fill up since it doesn't cost you anything more to do it.
Maybe it's just my area, but people are in your business constantly around here. I'm glad there are areas still laid back.
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Old 11-17-2018, 07:14 AM
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Still pushing around ideas, I had looked at using a tank in the back, but they hang down pretty low,
not wild about that, and most you have to fill thru the bed. I may just use a stock 1987 tank/pump
on the pass side, use it to feed DS, have the big pump in the DS and as the feed. But I lose the ability
to have a back up pump. I got time, more thinking to do.
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Old 11-17-2018, 12:13 PM
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Why not look into a single inline pump?

Last edited by LLLosingit; 11-17-2018 at 12:22 PM.
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Old 11-25-2018, 07:32 AM
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Old 11-25-2018, 07:05 PM
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Thanks Stevie. Interesting read. Curious how the amp comparison comes out.
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Old 11-26-2018, 07:30 AM
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What I ended up with doing is using 2 1987 tanks (fuel inj ones), they have the baffle in them
for the pumps. I got a L and R sending unit w/o pumps, and bought 2 Walbro 450 pumps. I moded
the sending units for AN fittings (comp. to #6 return, #8 feed) and made the pumps fit the sensors.
I used a piece of submersible hose to connect pumps to outlets. Everything will go to the large
brass 6 way valve, I'll go with this and see how it goes. Hopefully I can reg. pressure no problem, lol.
Using the orig plastic valve for switching tank senders.
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