<VV> OK to run switched dual electric fuel pumps? - no corvair

[Larry Forman]

Hi Everyone,
This has nothing to do with Corvairs, but might interest Corvair 
owners.   This application is for my Toronado powered Ultravan with an 
Olds 455.   Currently it has one Carter rotary vane external electric 
fuel pump for the Holley 4 BBL carb.    I would like to add a second 
identical fuel pump with the inputs to both filtered and connected to a 
T connection and then to the fuel tank outlet line.    My hope is that I 
could have a SPDT relay or switch to turn on either, but not both, fuel 
pump and have on-board redundancy.      I do not know if the rotary vane 
pumps can handle back pressure from another operating pump.   I suspect 
so, but would like confirmation that this should work and not damage the 
non-operating pump.

Since I am adding a fuel pressure gauge at the output of the fuel pump, 
at the worst case I could Tee in a second pump that is not powered and 
run the input of that pump into a catch basin.    That way I could watch 
the fuel pressure when I add the second fuel pump and also see if any 
fuel flows backwards toward what would become the gas tank outlet line 
in actual operation.  I do realize that often there is a fuel return 
line for overflow from the fuel pump and that this exists for some Corvairs.

For Corvairs, this might be something to consider to build in redundancy 
to the electric fuel pump system.

Thanks for any suggestions.

Larry Forman


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