"Special Service Tool?"

[chartscharts]

My F70's manual says checking the inline fuel strainer is 100-hour maintenance. It's on page 6-16 and 6-17 of the service manual.

It says to plug the fuel outlet of the strainer with a rubber plug and the "special service tool" to the other and to apply the specified pressure. And then replace the strainer if the specified pressure cannot be maintained.

Two questions.

1. With the outlet plugged, does this just test to see if the casing has a leak?
2. What is this "special service tool?" In the front of then manual it has a list of what I thought was all the special tools, but I can't find a match for the pump and gauge looking thing that is on page 6-17 for this procedure.

[DennisG01]

Wouldn't a hand-held pressure/vacuum tester like a Mity Vac work?

[99yam40]

that is a good question, it does not make sense to me to be checking a strainer like that.
to me testing a strainer would be to see if it was plugging up

maybe Bosco or someone else has some idea about what that test is suppose to test for

[fairdeal]

Look at page 6-17 again -
you'll see it says "Commercially available"
That means Yamaha doesn't sell it themselves,
its any generic device you would find 'on the open market'.

Personally, I don't see the point of pressure testing the filter -
perhaps its a liability thing, a "CYA" for Yamaha

If you have an doubt or concern, just replace it
The Yamaha filter costs ~$23
you can find perfectly suitable aftermarket parts for as little as $10 or less

[chartscharts]

Look at page 6-17 again -
...
its any generic device you would find 'on the open market'.

Thanks. But can someone link what this device might be? When I search amazon or google, I find lots of radiator pressure testing stuff or cylinder pressure testing stuff, but nothing that has a hand pump and generic adapters to test something like this.

Thanks for the advice on not doing it. Just really curious about why. Maybe they think if there's a pinhole leak it messes the vacuum/suction of the fuel? Or introduces air bubbles or something?

[DennisG01]

Thanks. But can someone link what this device might be?

Read my post again - I think that's what you're looking for, right?

[fairdeal]

That filter is on the pressure side of the mechanical fuel pump,
so if it leaks,
there's going to be fuel going out,
not air coming in.
When the engine is running,
the pressure on it can be ~7-8 psi (when the VST needle valve closes)

My guess is, as stated, the 29 psi pressure test is a CYA for Yamaha
lest fuel spraying under the cowling start a fire.

Maybe there actually has been a case where that occurred...

[chartscharts]

Read my post again - I think that's what you're looking for, right?

Yep, I see it now. Thanks!

[chartscharts]

That filter is on the pressure side of the mechanical fuel pump,
so if it leaks,
there's going to be fuel going out,
not air coming in....

Interesting! Ok, thanks for the info.

[Keithbaja]

Don't test it. Replace it and go boating. BTW careful with a "mighty vac/ pressure pump" around diesel fuel. kills the check valves. ask me how I know. LOL

[chartscharts]

"...go boating" is always great advice! Thanks!