Trip Tanks EFI Plumb Question

[Salashhavoc]

I have three tanks (Yes, a bit excessive, but effective for my needs...) and am switching to EFI.

Curious if the below diagram for plumbing would be the best solution? Or is there a better way...?

Thanks for your input!

 

[73azbronco]

Hard to see but I'd plump the other two into your main tank and run as required, just be careful about overfilling

 

[AxlesUp]

i might eliminate the selector valve and use two separate pumps to fill the main tank from the auxiliary tanks.

 

[sykanr0ng]

My current thinking is a switch valve between tank one and tank two ,then a transfer pump for tank three.
Two tank systems for EFI are or were available on Ford F series trucks, so OEM hardware for them exists.

 

[Salashhavoc]

i might eliminate the selector valve and use two separate pumps to fill the main tank from the auxiliary tanks.

With one inlet available into the tank, would a simple t be effective in the fuel line? Not sure how much fuel from one Aux tank might get diverted into the other aux tank without a shutoff... Or would the second pump for the 2nd aux tank prevent this?

 

[AxlesUp]

i would get a bulk head fitting for a fuel cell and install it for the extra line. simple, cheap, and effective.

i have seen people use a T in the vent line for a return. i am not sure that the pumps would act as a one way valve?

 

[Steve83]

Only the '90-up fuel pump has a built-in check valve. If you use that system, you can put as many tanks as you want in simple parallel. Note in this diagram that the fuel lines meet at simple Ts:



But they're expensive, so I wouldn't want to buy more than 1. Then you could use cheaper reciprocating (solenoid) pumps (which each have 2 1-way valves) in parallel to send fuel into the one with the high-pressure EFI pump. On each of the factory tanks' filler necks, there's a vent nipple. T into that line so that, if a tank overflows, it drains back into the previous tank. Then you can let the low-pressure pumps run continuously without worrying about overfilling. Or you could shut one off to use that tank as an emergency reserve. Look at the Single Supply Pump (and the Left side) in this diagram: