HI all,I bought a jpi  edm at OSH. last year but  didn't instal the fuel flow antisapating a forward sump mod over the winter, well the mod is nearly done and now it's time.JPI instructions say it should mount in the hose between  engine driven fuel pump and servo,however I often see  these  in the metered hose at the flow divider inlet, I was also told it is best to have as much straight hose as possable on each side of transducer   {no 45 or 90 degree fittings}   Is one location prefered, IT looks difficult to do the straight thing on top of the engine. 

Gene,

 

OK, believe all those claims that straight lines before and after the flow sensor count!  But listen up grasshopper - it is the interface that counts.

 

What?  Blasphemy!

 

Yes, if one is going to use the throttle body to spider flow to measure gph, you have chosen the correct path and will be rewarded with accurate information.  Yes, accurate if all absurdities are considered - take, for example, the reducer that allows -4 lines to operate thru the -6 sensor.  If you select the  -4 flare to -6 pipe for the input side, disaster will follow.   If you choose a -4 to -6  reducer, success will stick to you like peanut-butter to the roof of your mouth.

 

Why? One might ask.

 

'Cause the flare to pipe thread adapter has a small hole which produces horrible turbulence, whilst the reducer just provides a large exit hole for the fluid and any turbulence effect is eliminated.

 

Note that all the twists and turns of the flow towards the sensor are nullified by the adapter to sensor interface.  Trust me, been there, done that.

 

Success has been found by those that mount the sensor horizontally or vertically, as long as the flow is coherent into the sensor.  Adaptrers matter!