Zemco CompuCruise and fuel pumps
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Zemco CompuCruise and fuel pumps



Speaking of electric pumps!

Does anyone recommend a reliable electric fuel pump with built-in regulator? It's a stock, carbed, 258 in a Hornet. Too many products are high volume/high pressure, and I want to avoid a separate adjustable regulator and all the hoses and adjustments. 3psi at 20 gal/hour peak is fine.


The day before the Santa Fe trip I got the two main sensors of the CompuCruise installed: fuel flow sensor and driveshaft rotation (mph). I don't like making changes to things like fuel systems the day before a trip but, ...


(I've had the control/display box mounted for months, just not the sensors...)

I got a 100% complete, all manuals, parts, pieces, even the little tubes of glue, cable ties, the whole thing, for $5.00 at a surplus place a few years back. Missing only the top of the box. A hell of a find!

I'm having trouble with the fuel sensor; it works, but is erratic, about 5% - 10% error over a tankful. (eg. CompuCruise says I used 9.5 gallons, but I used 10). I suspect it's the pulsing action of the stock diaphragm pump. I've got the sensor in the suck side, not the pressure side. The error is plus and minus actual; if it was consistently one or the other calibration would fix it.


Zemco FY-technical-I aside:


Zemco chose a really flexible and simple way to calibrate sensors. For example, the driveshaft sensor is a coil bracketed to run about 1/4" from the driveshaft, and 2 or 4 magnets glued to the driveshaft; the fuel sensor puts out pulses with fuel flow.

Rather than "hard" calibration (eg. changing gears, etc) you calibrate MPH using highway milemarkers: you enter a starting milemarker, then miles down the road, another (CALibrate). The box calculates the needed correction factor. Simple!








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