DooWacka,
Thanks for the thread. A google search led me to it so I went ahead and joined.
It sounds like it'll work for my 06 Sportster but thought I'd ask the expert. Yes?
I'm blowing the 10A fuse for the pump and the shop said that the CEL is because the fuel pump is shorted. When I put a 15A fuse in, I can get the starter to crank but it won't start. When I pull the fuel line, there's no fuel being pumped. There's no way I'm paying $780 for a new fuel pump so your fix sounds like my best chance of getting back out on the water this year. By the way, when I looked up the P/N for my fuel pump it's the same one that's used in the Can Am (go figger).
My original intention was to purchase an in line fuel pump and just fabricate my own port from the bottom of the tank, cut the leads to the fuel pump and connect them to the new one but leave the old one in place. In reading the thread though, it sounds like there is not an active fuel pressure regulator in the system. The fuel pump just drains fuel from the high pressure line back in to the tank to release pressure back down to 107 psi. Is that true? I bought a 140 psi pump that hasn't arrived yet for $50 off of ebay. Will that pressure damage the system?
Thanks for any help you can give.
t4b
Looking at the very first post in this thread, I have a table showing all the DI PWC that I thought BRP made, I don't see an '06 Sportster, just '04 and '05. But if it is a DI then you most likely need the high pressure pump.
When these OEM pumps get older you will often have an increase in amps drawn until the fuse blows.
Don't mess with an external pump, just rebuild the fuel pump module as is shown in the guide, and as many have done before.
There is a fuel pressure regulator in the Fuel/Air Rail, that just allows any extra fuel to return to the tank. Your new pump may be capable of 140 psi, but the regulator will never allow that pressure to build. I have tested the OE pump to over 160 psi. The regulator allows the rail to stay at the 107 psi required.
Is the new 140 psi pump an in-tank replacement? If so, could you give a link so people can see?
The problem is not just finding a pump to give the 107 psi pressure, but doing it with a reasonable current draw of under 9 amps. The OE pump only draws about 4 to 5 amps. If your pump draws to much, not only the battery doesn't charge but the MPEM doesn't like it and gets flakey. There are also other problems associated with to high of current draw. There are several automotive pumps that can give the pressure required but draw 12+ amps to do so. The manufacturers of those pumps don't care about current since there is plenty available in the vehicle. The BRP 951 Magneto puts out about 220 watts, so that is about 18 amps max. That is all you have to run everything including charging the battery.
There are plenty of in-tank fuel pumps on eBay and elsewhere that advertise working in a DI, so I hope you haven't selected an automotive external pump that would probably draw 16 amps.