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She laid over....

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Fuel Pressure Test Adapter OST-FST-001 for Mercury, Yamaha, Suzuki

Our fuel pressure test attachment is designed to allow a conventional fuel pressure gauge with Schrader fitting to connect to 4 stroke EFI pressurized fuel systems that have no Schrader fitting but…
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This is what you need to test fuel pressure on yamahas. Good to have for period maint checks if fuel system hasnt been altered in a way that allows easy testing. Disconnect line at rail and ad neccessary ends to the t fitting and this creates a flow through from the pump and then connect fuel pressure tester like what your getting at harbor freight to the T fitting.
 

Doc Harley said:
I'm just going to buy (if needed) the gauge from harbor freight and then plug it right into the top of the pump.
The gauge from harbor freight has a bleed off to allow fuel to keep moving.
I'm sure I can make something but it's only $32.
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You need to configure in a way that fuel flows through to the rail. If you just add it to top of tank you will get a reading of unregulated pump pressure which will help to diagnose if the pump is bad if it doesnt develop pressure or much of it but will tell you nothing about how the regulator is working. Making it T into the fuel line will show actual fuel system pressure as the engine sees it. Like trail leader mentioned, good idea to remove sending unit when installing pump so you can make sure socks are flat in tank. Ive had one get caught up and not go where it is supposed to and if that happened sled wouldnt run unless you have a tank with quite a bit of fuel in it.
 
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KnappAttack said:
If you can hear the pump working key on, but engine off, I suspect the pickups in the tank or the internal pressure hose to be the culprit.
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Gave this some thought...if my return was routed to deliver fuel to slipper, why would misrouted or bent pick-up tubes be considered as a possible problem?
IDK, just asking.....
 
Put stock pump back in and try, quick and easy.
 
For those of you paying attention, pulling the return line to check for fuel pressure is not the answer. As it pressurizes the regulator and fuel rail, but does not return anything back to the slipper. If I'm wrong please correct me.
IMG_20240108_072750636_copy_1536x2048.jpg
 
So I pulled the line off the top of the pump. Fuel pump engages with key, fuel coming out, then stops after 3 seconds or so. Very similar to the pressurizing of the rail process.
Should I continue with pulling the pump?
IMG_20240108_074619012_copy_1536x2048.jpg
 
that shows you pump is turning on but you still dont know pressure from pump, do you have the adjustable regulator off the end of rail? is your return back to slipper? i also had issues with the crows feet plugged and not allowing fuel to be picked up.
 
Doc Harley said:
So I pulled the line off the top of the pump. Fuel pump engages with key, fuel coming out, then stops after 3 seconds or so. Very similar to the pressurizing of the rail process.
Should I continue with pulling the pump?
View attachment 175038
Click to expand...
Here's how I think... knowing I recently changed the pump and now my sled is acting up I'd be reversing what I did to see if my problem goes away. Maybe there's a better way but that's what I would do.

Then if problem remains you can move on knowing for sure it isn't your pump.
 
Keep it simple, put stock pump back in, check all lines, filters, etc when doing so. Start chasing your tail real easy.
 
SD26 is a boost leak IMO. I do not believe its related to your idle/fuel issue. How old is the "sock" filter on your pump? Also the filters on the end of the Y that extends forward off the pump. .. I like to replace the sock filter (on bottom of pump)every other year or so.. You guys noticing what the sock looks like after using Boostane??? Not saying to not use Boostane but wondering if it effects the "sock" filter off the bottom of fuel pump.
 
If you decide to go with a rubber submersible fuel line instead of the plastic , be careful how you route it.. Make sure it does not have a kink or pinch anywhere in it.. I have the plastic on my 2022 no issues what so ever.. Wondering if you heated the plastic to much when installing ?
 
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