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01-28-2015, 08:14 PM | #1 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,610
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Re: EFI with factory Fuel Tank??
Quote:
Be sure and check out the "LS Swaps" Forum too.... LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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08-13-2018, 08:53 PM | #2 |
Registered User
Join Date: Mar 2014
Location: Ionia, MI
Posts: 199
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Re: EFI with factory Fuel Tank??
I am going the other way and putting a 72 tank into my 87 and came across this thread.
Here is my plan for the vent line routing; Put a cap on the sending unit plugging that line. Have the two ports on the drivers side connected with a brass T in between them Have the passenger run over to the drivers side into the middle of a 2nd t that connects to the first (lower) T. Then I have a line running all the way from the (Upper) T to the passenger side then the line does a 90 and goes up inside the B pillar then down before coming back and folling the fuel line through the floor and inside the frame rail to the 87's evap. This should allow the truck to be on it's side or roof and little to no fuel to enter the evap line thanks to gravity. For the fuel line I have something that seems like it should work. I have the return line running to A high pressure T fitting with the tank feeding into the top of the T and the pump feeding from the bottom of the T. Now the circulating of fuel from the return back to the pump should siphon fuel from the tank and only as needed. If I run the pickup dry then cavitation could happen but will resolve itself as the bubbles either return to the tank or are pulsed into the tbi creating a momentary lean. I believe I will need to prime the system the first time. But once primed as lone as I don't run completely out Of fuel this should keep siphoning fuel from the tank into the loop and not require a second pump. The pump will be pushing fuel. But as the T is above the pump any return fuel will be pushed against the backside of the pump so the "pulling" will be minimal. I am thinking it should gravity siphon and keep the loop full and when running the thing should find a psi where it will stop pulling fuel from the tank to keep the loop full . If I go hard throttle to nothing a surge may be sent back into the tank. But once back on the throttle it should continue to siphon and not be an issue. Or I could be horribly wrong and only make it a mile and the thing starts to sputter. Plan B is to just do the idea of taking it to a radiator shop and doing the 3 ports on the bottom of the tank to gravity feed into the pump. That being said I don't want to modify a bran new tank if I don't need to. |
08-14-2018, 09:58 PM | #3 |
Registered User
Join Date: Mar 2014
Location: Ionia, MI
Posts: 199
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Re: EFI with factory Fuel Tank??
Decided I am going to take it to a radiator or welding shop and have them braze 3 bungs into the bottom.
I am almost confident enough to braze it myself. But figure the cost in materials will be around 1/2 what a shop will charge and were talking gas so they can take my cash for the professional outcome. Use the same T return as before. Just have the 3 feeds going into 1 above the T The pre pump filter will catch anything big. I am pretty good about maintenance and the filters are only around $10-$20. I could clamp the 250psi rated rubber line if I need to install a new pump or filter in a parking lot.
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1991 Metro commuter 1991 s10 future project truck 1987 V10 backup daily/junk truck 1985 K20 Winter beater 1991 R30(squarebody) c/c flatbed towrig 1994 s10 80"wb custom build |
08-15-2018, 09:42 AM | #4 |
Registered User
Join Date: Aug 2009
Location: Auburn
Posts: 78
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Re: EFI with factory Fuel Tank??
The OP started this thread in 2009 and things move on. Holley's Hyrdamat has since been released and may be of interest to those needing to utilize a stock tank.
https://www.holley.com/products/fuel_systems/hydramat/ |
08-15-2018, 03:53 PM | #5 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,157
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Re: EFI with factory Fuel Tank??
cerial-why not use an '87 factory TBI tank with the pump in the tank and a baffle and everything? It's a bolt-in to all 73-87s. Why reinvent the wheel?
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
08-16-2018, 12:45 PM | #6 | |
Registered User
Join Date: Mar 2014
Location: Ionia, MI
Posts: 199
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Re: EFI with factory Fuel Tank??
Quote:
The saddle tanks sit to low and a rear tank requires a heavy skid plate which traps dirt and rust the tank. An in cab tank eliminates issues with clearance, rust, and in my case snow sitting on the tank. Also safer location with current headache bar and later inside roll cage. Trying to not have anything custom. But the 3 ports makes sense to save the pump and keep it quieter.
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1991 Metro commuter 1991 s10 future project truck 1987 V10 backup daily/junk truck 1985 K20 Winter beater 1991 R30(squarebody) c/c flatbed towrig 1994 s10 80"wb custom build |
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efi, factory fuel tank, pump pressure |
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