Problems with cool fuel pump in...
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08-10-2020 11:14 AM
Problems with cool fuel pump in Horizon engine. Was wondering if anyone has any thoughts on replacing mercruiser cool fuel pump with a regular electric fuel pump?
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08-10-2020 11:36 AM
Hasn't the latest revision resolved the problems?
Doesn't the good will warranty coverage provide the parts, requiring the owner to pay labor?
Regardless of any aftermarket solution implemented, it must include fuel cooling to prevent vapor lock and it must be ABYC compliant for safety.
My 2000 380DA Mercruiser 454 MAG MPI Horizon engines were fine up north, but always suffered vapor lock in the tropics after a one hour stop until I designed and installed a thermostatically controlled heat extraction system. My solution has been 100% effective.
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08-16-2020 05:28 AM
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08-16-2020 07:38 AM
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08-16-2020 10:37 AM
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08-16-2020 10:51 AM
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08-16-2020 11:04 AM
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08-16-2020 02:29 PM
My solution was to design and install a thermostatically controlled heat extraction system, drawing air from up high, on top of the engines.
My system uses a 12VDC thermal controller and a 10kOhm NTC thermistor to sense the engine room temperature, with 4"
220cfm Yellowtail blowers ducted to the exterior, all using UL rated ductwork.
The thermistor wire was extended to reach the controller located at the helm using shielded and properly grounded wiring. The blowers are properly fused.
The system toggles on and off automatically to maintain the setpoint engine compartment temperature.
https://live.staticflickr.com/65535/50234638307_9c39d57e9f_c.jpg
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08-16-2020 07:40 PM
But heat rises, so sucking air from the bottom is the worst place to help with decreasing the engine compartment temperature. That is why I suck from above the engines.
These images show that I removed the side panels to add two additional fittings , retaining the existing two fittings for the blowers sucking from the bottom, plus adding two more for the heat exhaust blowers sucking from above the engines.
Note that the fitting pipe is too long, so I cut it shorter, as-shown.
Two images are in progress, one image showing one side panel modified, the other not yet modified, the other image showing the one fitting pipe modified, the other pipe intact.
(The other modification I did on these panels was to add a forced air intake, for massive cooling of my high-volume, high-pressure air compressor, as-shown in this topic: https://trainhornforums.com/showthread.php?t=6993)
https://live.staticflickr.com/65535/50235258716_991bde4276_c.jpg
https://live.staticflickr.com/65535/50235472627_888cb87acc_c.jpg
https://live.staticflickr.com/65535/50234601893_ca104dee1d_c.jpg
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