Zemco CompuCruise and fuel pumps
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Zemco CompuCruise and fuel pumps
- From: Tom Jennings <tomj@xxxxxxx>
- Date: Mon, 2 Jan 2006 15:02:23 -0800
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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