2000 powerquest 500 efi
05-24-2009 | 07:58 PM
#1
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2000 powerquest 500 efi
I have a 2000 Power Quest Vyper w/500efi's that are expericencing vapour locks on start up after a hot soak. The pumps sound like they are running dry. After multiple key cycles you will hear the pumps load down and start fine. This system only has one electric fuel pump under each harmonic balancer.No mech. pumps. Anyone else experiencing this problem?
05-30-2009 | 07:59 AM
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From: Big Rapids, MI
Vapor Lock with Hand Pump 500 EFI's
Scarab26,
I had the exact same problem 2 years ago when I stored the boat with winter fuel(filled up in late Nov, early Dec.) it starts and runs fine then after the heat soak(maybe 1/2 hour) both engines start and run fine for 30 seconds or so and both stall at the same time. Your options are: burning off that tank of fuel and refilling with summer fuel, adding Marvel Mystery Oil to help prevent the vapor lock, OR adding an outboard primer bulb into the fuel line BEFORE the water separator/filter! I did the latter as an inexpensive troubleshooting tool. When the engines start to stall pump the bulbs and you'll hear the engines pick back up. They are still in the boat in case I run into some more bad fuel........my friends laughed at me and call me a redneck(which I guess I am!) and I now refer to the engines as the Hand Pump 500's! Let 'em laugh but it works, and once I added a gallon of Marvel Mystery Oil and filled it with a fresh tank of fuel the Hand Pump 500's have been running flawlessly. Don't waste your money buying the mechanical pumps! They did this from the factory on the 01's I believe, but it's not necessary if you add the $5 primer bulbs.
Hope this helps,
Paul in Big Rapids, Home of the "Honest Brew"
I had the exact same problem 2 years ago when I stored the boat with winter fuel(filled up in late Nov, early Dec.) it starts and runs fine then after the heat soak(maybe 1/2 hour) both engines start and run fine for 30 seconds or so and both stall at the same time. Your options are: burning off that tank of fuel and refilling with summer fuel, adding Marvel Mystery Oil to help prevent the vapor lock, OR adding an outboard primer bulb into the fuel line BEFORE the water separator/filter! I did the latter as an inexpensive troubleshooting tool. When the engines start to stall pump the bulbs and you'll hear the engines pick back up. They are still in the boat in case I run into some more bad fuel........my friends laughed at me and call me a redneck(which I guess I am!) and I now refer to the engines as the Hand Pump 500's! Let 'em laugh but it works, and once I added a gallon of Marvel Mystery Oil and filled it with a fresh tank of fuel the Hand Pump 500's have been running flawlessly. Don't waste your money buying the mechanical pumps! They did this from the factory on the 01's I believe, but it's not necessary if you add the $5 primer bulbs.
Hope this helps,
Paul in Big Rapids, Home of the "Honest Brew"
