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3 gallons or less in your tank!!

SideHogger said:
Used same size as stock fuel line to drilled out red elbow, 1/4 inch. But was a bear to get that fuel injection line on. Used Hurricane elbow at tank. Anything to worry about?
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Your using stock pump correct? If so then you are all set.
 

I'm running 1/4" line back to fuel pump. The elbow is 1/4" so even with 5/16" hose your choked to 1/4" at the elbow. I wasn't comfortable with how the 5/16" hose fit the 1/4" elbow. Just my 2 cents.
 
justinator said:
Just wanted to share a little bit of info that may save some from chasing their tail later this winter. I advise if you have installed a larger fuel pump, mainly the gss342 G3(generation 3) pump to get the proper test fittings from yamaha and test your fuel pressure at the rail. I recently installed a brand new 342 g3 pump on my 22 winder with stock regulator. I tested the fuel pressure to make sure everything was in check. Sled had 50-52psi at rail with key on sled off. Started sled and pressure rose an additional 1-2 psi. I assumed faulty regulator. I had another brand new yamaha regulator here so I swapped it out. No change. I then installed a brand new hurricane regulator with no change. I then removed my 5/16 return line from tank and ran it into a bucket with no change. This was to confirm no blockages at basket of tank. I then removed the line from the regulator and ran a short new piece of line to bucket with no change. I checked the pressure on my 20 winder to make sure gauge was not messed up as I knew for a fact that sled always had 43.5-44psi at rail with older generation big pump and stock regulator. it tested perfectly at 43.5 psi. I then removed the rail and regulator from the 20 and installed on 22 to rule out any problem with the rail even though this seemed very unlikely as its a pretty basic part. Still had 50-52psi. I then began to do some reading on regulators and efi systems as I had no idea why the regulator wasnt doing its job and maintaining pressure at 43.5psi like its supposed to. Its possible for regulators to become too small when fuel pumps are upgraded and it doesnt have the ability to maintain its target pressure. This still left the question as to why my 20 with big pump has perfect pressure and my 22 is nearly 10psi too high. Well at some point along the line walbro upgraded the pumps to the G3 model. One of the upgrades was increasing the pumps output from 86psi to 110psi. So basically the extra 24 psi is over the threshold of what the tiny regulators can handle. I had previously mentioned that precision used 5/16 line in their pump upgrade kit but I was wrong, they use 3/8. They use a regulator with large output ports and big tank fittings. The hose is 3/8 with 3/8 size an fitting on one end with a quick connector factory style fitting on the other. After speaking with them these large return hose and fittings/regulator is to insure the regulator can handle the job of the big pump and maintain 43.5psi of pressure. I had noticed that just lighly compressing my 5/16 line caused the pressure to increase rapidly on my gauge and I thought there wasnt much room for error. A bend a little too tight could cause a dramatic increase in pressure. I was able to force the pressure at the rail down to spec using td adjustable regulator but it caused the fuel pressure to flutter rapidly on the gauge. I had to turn the td regulator down to 36-37psi on the regulator to get 43.5psi at the rail. I thought the gauge maybe off on the regulator but I tried it on my 20 winder and 44psi on regulator showed 44psi at rail and no weird fluttering. I also tried another brand new gss342g3 pump I had here to make sure I didnt get a defective pump on steroids and same results. Now just because you purchased a new pump recently does not mean its a G3 pump as even though these were upgraded a while back there are 1000's of older generations hanging around at different vendors and distributors and it will likely take a while before its nothing but G3's available. Checking your fuel pressure at the rail is a good idea if youve upgraded pumps as running at higher psi may cause some drivability/rich conditions more noticed at idle and low speeds similiar to what the old red return elbow caused for some people back in the early sidewinder days. I am going to confirm my findings some more by installing a G3 pump in my 2020 and rechecking fuel pressure. Closed loop may mask this problem by pulling fuel away but I believe it was mentioned on here that closed loop is not active at idle and very low speeds. I do not know this for certain though. Just something to keep in mind.
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Another reason why I am running an adjustable fuel pressure regulator. Like I mentioned before, I pinched off my return line and pressure went up over 100 psi with the high volume pump.
 
1nc 2000 said:
Another reason why I am running an adjustable fuel pressure regulator. Like I mentioned before, I pinched off my return line and pressure went up over 100 psi with the high volume pump.
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I tried my adjustable regulator as well and while I was able to lower the pressure at the rail it caused a really weird rapid flutter of psi at my rail. The gauge on regulator was steady and psi on regulator read much lower than what was at the rail. To verify the gauge was working correctly I hooked it up to my other winder and whatever psi regulator was set at matched what I had at rail tester like it should. That onr has earlier generation high volume pump. I believe the adjustsble regulator is too small as well for G3 pumps. I think PEFI is thr only one that covers all bases. Again, this may or may not cause any run ability or drivability issues but is more to keep some thing in mind in case you have any odd issues
 
justinator said:
I tried my adjustable regulator as well and while I was able to lower the pressure at the rail it caused a really weird rapid flutter of psi at my rail. The gauge on regulator was steady and psi on regulator read much lower than what was at the rail. To verify the gauge was working correctly I hooked it up to my other winder and whatever psi regulator was set at matched what I had at rail tester like it should. That onr has earlier generation high volume pump. I believe the adjustsble regulator is too small as well for G3 pumps. I think PEFI is thr only one that covers all bases. Again, this may or may not cause any run ability or drivability issues but is more to keep some thing in mind in case you have any odd issues
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What you thinking is the main issue? The different fuel pump? Not sure what TD and Hurricane or precision. selling for pumps? And or guys buying direct? Sounds like the Gen 3 is turned up more then previous pumps and causing it?
 
jonlafon1 said:
What you thinking is the main issue? The different fuel pump? Not sure what TD and Hurricane or precision. selling for pumps? And or guys buying direct? Sounds like the Gen 3 is turned up more then previous pumps and causing it?
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Thats exactly it, I BELIEVE the gen 1 and 2 pumps running at 85-86 psi they were shipping at was probably just under the threshold of what the regulators could handle. The new gen 3 runs at 110psi and I believe exceeds the regulator/small ports capacity. Precision addressed this possibility with with there big regulator(3/8 ports) with matching 3/8 line and 3/8 port on tank. I believe everyone is using the gss342 pump but tons of gen2’s still in circulation so ordering one you may get a g2 or a g3. Mine come factory direct and I ordered 2 at the same time and they are both g3. The pump in my 2020 is not at g3 and has perfect psi at the rail. I have more time then I care to talk about trying to figure this out and thats what I came up with, precision confirmed with there explanation of the use of large return parts. Again, only way to know is to check pressure at the fuel rail connection with yamaha test fittings. I have no clue as to what or if any issues someone may have cause of this but figured id share so it may be easier for someone to diagnose IF they develop and runnability issues.
 
Why is fuel injection hose recommemded instead of just 50psi rated fuel hose (SAE 30R7 hose)? I don't see that return line building anywhere near 50psi. I believe the stock return line is the 30R7 type hose.
 
justinator said:
Thats exactly it, I BELIEVE the gen 1 and 2 pumps running at 85-86 psi they were shipping at was probably just under the threshold of what the regulators could handle. The new gen 3 runs at 110psi and I believe exceeds the regulator/small ports capacity. Precision addressed this possibility with with there big regulator(3/8 ports) with matching 3/8 line and 3/8 port on tank. I believe everyone is using the gss342 pump but tons of gen2’s still in circulation so ordering one you may get a g2 or a g3. Mine come factory direct and I ordered 2 at the same time and they are both g3. The pump in my 2020 is not at g3 and has perfect psi at the rail. I have more time then I care to talk about trying to figure this out and thats what I came up with, precision confirmed with there explanation of the use of large return parts. Again, only way to know is to check pressure at the fuel rail connection with yamaha test fittings. I have no clue as to what or if any issues someone may have cause of this but figured id share so it may be easier for someone to diagnose IF they develop and runnability issues.
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Thanks for posting. I got a pump from TD back in March. I already installed it. I’m about to turn the key on mine.
 
twyztid said:
Why is fuel injection hose recommemded instead of just 50psi rated fuel hose (SAE 30R7 hose)? I don't see that return line building anywhere near 50psi. I believe the stock return line is the 30R7 type hose.
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Return line can be a 50 psi fuel line no issues. just like to see guys buy a decent fuel line. Lots of cheap crap online. Ask me how I know?
 
justinator said:
Thats exactly it, I BELIEVE the gen 1 and 2 pumps running at 85-86 psi they were shipping at was probably just under the threshold of what the regulators could handle. The new gen 3 runs at 110psi and I believe exceeds the regulator/small ports capacity. Precision addressed this possibility with with there big regulator(3/8 ports) with matching 3/8 line and 3/8 port on tank. I believe everyone is using the gss342 pump but tons of gen2’s still in circulation so ordering one you may get a g2 or a g3. Mine come factory direct and I ordered 2 at the same time and they are both g3. The pump in my 2020 is not at g3 and has perfect psi at the rail. I have more time then I care to talk about trying to figure this out and thats what I came up with, precision confirmed with there explanation of the use of large return parts. Again, only way to know is to check pressure at the fuel rail connection with yamaha test fittings. I have no clue as to what or if any issues someone may have cause of this but figured id share so it may be easier for someone to diagnose IF they develop and runnability issues.
Click to expand...
What are you using to test pressure at the rail. You mention Yamaha test fittings. Do you have a part number? Thanks
 
snowcaine said:
Thanks. What are your thoughts on the PEFI fuel pump upgrade kit? Looks like a quality setup, but I’d want to know if the preset regulator they send with the kit can be adjusted. And, if it can’t be, how would a fuel pressure regulator incorporate into that kit. Good info on the fuel demons you’ve been fighting!
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The precision kit is top notch and a quality item. They never cut corners on parts and the price reflects that lol. They have 2 regulator options. One is 43.5 psi. The other is for their stage 4 kit and is 56 or 58 psi and I believe is only sold with their stage 4 kit.Their regulators are non adjustable. An adjustable regulator could not be added to the kit as it would involve removing their regulator from the rail and installing the return line nipple thats used with an adjustable regulator. The adjustable regulator replaces the rail mounted regulator included in their kit.
 
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