[urq] RE: [Es2] fuel pump

[Buchholz, Steven]

> What amount of pressure should be coming from the stock fuel pump?
> Does anyone know what the pressure should be at the fuel rails for an
> AAN and a AAN/RS2ed motor?

... what I was trying to say in my earlier post was that the pump does not
determine pressure in and of itself.  Of course if the pump were not up to
the task it would not work, but what you'd be looking at would be flow rate,
not pressure.  In the WX motor the pressure is determined by the regulator
in (or near) the metering head.  I'm not familiar with the AAN, but on my
EFI'ed PT the pressure is determined by a regulator that feeds from the fuel
rail to the return line.  This is what I was talking about when I said the
control system for the engine should make the pressure adapt to the
requirements of the FI system ... 
> 
> During a conversion conversation regarding converting my AAN fuel rail
> so it would fit the RS2 Intake Manifold I'm using, I was questioned as
> to if I would want a fuel pressure fitting installed so I 
> could monitor
> the pressure at the IM/fuel rail. Converting the AAN fuel 
> rail with the
> pressure indicator fitting was almost the same price as buying the
> proper RS2 rail, which I haven't done either just yet. Doubt the RS2
> rail comes with a fitting to monitor Fuel Pressure, but don't know for
> sure.
> 
Fuel pressure is not as important on an EFI system as it is on an old CIS,
but it can give you clues of impending problems.  I'd say, go with the rail
with the tap off point for the pressure transducer ... you can always plug
it.  I'm thinking that my comprehensive instrumentation package for my urq
will include a fuel pressure gauge ... but it will likely be measuring
control pressure on the CIS ... 

Steve B
San Jose, CA (USA)