[Supras] Dual Walbros

[Brandon]

Yes if one pump fails, then the remaing pump will pump through the dead pump 
back into the fuel tank.  Check valve would be a bad idea .... if you are 
tuned using twin pumps and one dies, but the other remains you are going to 
go very lean, but if one dies and you lose 98% of your pressure the engine 
should just die, and be fine to run again when the pump issue is resolved. 
If you are that worried about a pump dying, a manual valve would be the way 
to go, then you could shut down the dead pump and limp it home on the 
remaining.

----- Original Message ----- 
From: "Rockey Fox" <supr91tt at yahoo.com>
To: "sprigmo1" <sprigmo1 at yahoo.com>; "car club" <supras at supras.com>
Sent: Tuesday, August 29, 2006 8:56 PM
Subject: Re: [Supras] Dual Walbros


> Are the dual pumps needed for redundancy or volume?
> I'm not sure of the Walbro pump design and how it acts
> when not energized but running in series may seriously
> restrict fuel flow if one of the pumps failed. On the
> other hand if in parallel, if one of them fails will
> your fuel flow back through the dead pump which would
> be the path of lesser resistance instead of
> maintaining desired (or required) pressure to your
> FPR?
> Personally if I were installing two fuel pumps I would
> consider a check valve downstream of each pump and run
> them in parallel to a common line past the back flow
> preveter (check) valves and then to the FPR.
>
> Just an uninformed opinion on this one, but an
> interesting thought,
>
> Rockey 91T
>
>
> --- sprigmo1 <sprigmo1 at yahoo.com> wrote:
>
>> Anyone have the wiring schematic for running dual
>> Walbros?  I just got my second pump and want to
>> install it before I get my new turbo!
>>
>>   Malik
>>   It Ain't Eazy Being Me!!!!
>>   92Trbo Supra
>>
>>
>>
>>
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