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Saddle tanks

 
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chimp koose
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PostPosted: Thu, Nov 30 2017, 4:49 pm    Post subject: Saddle tanks Reply with quote

OK , I am rethinking my fuel tank situation and am now considering saddle tanks . I would like to have useable trunk space . If I use non vented gas caps and run the vent to the opposite end , bottom of the tank there should be no drain issues ????? Has anyone used them and what plus or minus could you tell me of ?I will run a series of baffles and I have robust running board mounts so load bearing should not be an issue . Also the car sits with a 4degree rake so the front edge of the tank should always be low ( except up a steep grade )
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kb426
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PostPosted: Thu, Nov 30 2017, 6:33 pm    Post subject: Reply with quote

I'm guessing you are running carb(s) and not efi so a pump sump is not an issue. Everything I have done for decades has a non'vented cap and a roll-over valve or just a vent hose that is higher than the tank. Are you planning on running a valve to select tanks or having a combining hose?
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chimp koose
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PostPosted: Thu, Nov 30 2017, 8:22 pm    Post subject: Reply with quote

which is better ? I will use an electric fuel pump , maybe one for each tank . Not sure just what to do or if I should do saddles or not . opinions please
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kb426
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PostPosted: Thu, Nov 30 2017, 8:39 pm    Post subject: Reply with quote

Because I live hours away from everything, capacity is important. If you're going to drive hundreds of miles, put on the saddle tanks. If not, you can always have a trailer to pull to carry stuff while the trunk is full of fuel. Have you checked out Tanks site for model a tanks? Might find enough info to make the decision.
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Arnold
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PostPosted: Fri, Dec 01 2017, 8:49 am    Post subject: Reply with quote

Couldn't resist. Had a 1/2 ton with Factory "Hi-Perf. Psgr" (454) cast in the block. 2-20 gallon tanks. If I ran it hard I could get LESS than 80 (EIGHTY) miles per tank Shocked Twisted Evil Laughing
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chimp koose
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PostPosted: Fri, Dec 01 2017, 9:33 am    Post subject: Reply with quote

I'll check the tanks site . Had occasion once to run out of fuel in a semi that had saddle tanks . There was plenty of fuel in the one tank but because of the slope in the road it drained one tank and we ran out .Had to prime the pump to get going on the other tank . I am wondering about the supply to a front pick up tank if I am going up a steep grade with a low tank . Maybe I just think too much ? I have to use electric fuel pump or pumps as there is no room for mechanical in my car .
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enjenjo
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PostPosted: Fri, Dec 01 2017, 11:57 am    Post subject: Reply with quote

chimp koose wrote:
I'll check the tanks site . Had occasion once to run out of fuel in a semi that had saddle tanks . There was plenty of fuel in the one tank but because of the slope in the road it drained one tank and we ran out .Had to prime the pump to get going on the other tank . I am wondering about the supply to a front pick up tank if I am going up a steep grade with a low tank . Maybe I just think too much ? I have to use electric fuel pump or pumps as there is no room for mechanical in my car .


If you use multiple pumps you have to use check valves in the lines, or a selector valve to keep the fuel from pumping to the other tank. You could use one pump to supply the engine from one tank, and a second smaller pump to transfer the fuel to the primary tank from the second one as needed. I would seriously consider a return line system considering the characteristics of fuel now days. The refineries do not consider vapor pressure any more because of fuel injection, and many carburetors can suffer vapor lock more easily without a return line.

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chimp koose
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PostPosted: Fri, Dec 01 2017, 4:43 pm    Post subject: Reply with quote

I am thinking that eventually I may go to the FITech injection system and an OD trans so a return line would be a good idea . I first need to complete a running car and THEN I will start modifying it further . I need to make sure the fuel system will pass NHRA tech as well since I will need a place to test the nitrous Very Happy
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chimp koose
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PostPosted: Fri, Dec 01 2017, 4:46 pm    Post subject: Reply with quote

My hope is that when done I can hop in and drive for hours without a fuel stop . My Anglia had an 11 gallon tank . I want at least 16gallons or more in this one .
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kb426
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PostPosted: Fri, Dec 01 2017, 7:51 pm    Post subject: Reply with quote

16 x 231 cubic inches per gallon = 3696 /144 = 25.6 cu. ft . The Tanks model A tanks are listed as 7 gallon per side for a 29. Sounds like this won't get your desired result.
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PostPosted: Fri, Dec 01 2017, 8:34 pm    Post subject: Reply with quote

kb426 wrote:
16 x 231 cubic inches per gallon = 3696 /144 = 25.6 cu. ft . The Tanks model A tanks are listed as 7 gallon per side for a 29. Sounds like this won't get your desired result.


What is that in Hogs heads?

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kb426
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PostPosted: Fri, Dec 01 2017, 8:50 pm    Post subject: Reply with quote

If you're talking beer, it's 1/4 hogshead. If wine, it's a smidgen less. Smile
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chimp koose
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PostPosted: Sat, Dec 02 2017, 1:55 am    Post subject: Reply with quote

t frame is much narrower than an A. nearly 11 inches from frame to running board . bottom of running board to under side of car over 9 inches . running board 43 inches long . I am looking at how I could make them so that they could be removed easily .
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chimp koose
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PostPosted: Sat, Dec 02 2017, 2:06 am    Post subject: Reply with quote

12x12x12 for cubic feet ballpark of just over 2 cubic feet for 16 gallons. I could make 2 tanks at 7x9x34 and be close .
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kb426
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PostPosted: Sat, Dec 02 2017, 8:06 am    Post subject: Reply with quote

Just in case you need this, that 91 f150 had dual tanks. The switch controlled the pumps and sending units but the switching valve was fairly large. It would be real difficult to hide on a rod. There surely is something better on all these late model trucks.
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chimp koose
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PostPosted: Sat, Dec 02 2017, 11:06 am    Post subject: Reply with quote

the more I think about it the more I am leaning toward saddle tanks . I will have to look at how OEM systems do it , probably in fuel injected trucks as I will need to use electric pump/pumps .
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moose
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PostPosted: Sat, Dec 02 2017, 1:49 pm    Post subject: Reply with quote

The last OEM truck I owned that used twin tanks the switch was done via na electric valve. when it was switched it swapped the sending unit signal and fuel line routing. This was a late 70's Chevy.
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chimp koose
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PostPosted: Sat, Dec 02 2017, 6:24 pm    Post subject: Reply with quote

Moose that would have had a mechanical pump down stream from the valve , I need electric before the valve . I really had not given much thought to the fuel gage sender , that needs to switch too doesn't it !
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kb426
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PostPosted: Sat, Dec 02 2017, 7:42 pm    Post subject: Reply with quote

C.K. the f150 switch did both. Would it be better to use a transfer pump from one tank to the other and have one efi setup????
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PostPosted: Sat, Dec 02 2017, 8:19 pm    Post subject: Reply with quote

On my 77 Silverado w/dual tanks I got tired of having to fill from side to side, so I ran a pipe across the frame and tied the filler necks together so I could fill both tanks from either side. Also due to age the electric switching valve started leaking so each side would level as fuel was used, essentially with two 16gal tanks it became a 32gal tank, which was ok with me. Just have to pay a little more attention to the fuel gauge.


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