Fuel rail pressure gauge connector. Anyone know the fitting type?

[RealWing]

Any Spyder mechanics know how to connect a pressure gauge to the fuel rail? Ie. what type or size of connector?
This is what we have in our shop kit.

 

[Snowbelt Spyder]

You don't connect the gauge to the fuel rail. In the 1330 fuel system, the fuel pressure regulator is integrated into the fuel pump module in the fuel tank. You disconnect the pressure hose at the top of the tank, and put in a T connector adapter. Been that way since 2014. You would benefit from purchasing a shop manual. There is a BRP part number for the adapter - 529036396 - if you could actually get one. Or make up your own. But typically a fuel pump either works or it doesn't. If it fails, you get a code. Not much cause for a pressure gauge, anymore.

 

[RealWing]

You don't connect the gauge to the fuel rail. In the 1330 fuel system, the fuel pressure regulator is integrated into the fuel pump module in the fuel tank. You disconnect the pressure hose at the top of the tank, and put in a T connector adapter. Been that way since 2014. You would benefit from purchasing a shop manual. There is a BRP part number for the adapter - 529036396 - if you could actually get one. Or make up your own. But typically a fuel pump either works or it doesn't. If it fails, you get a code. Not much cause for a pressure gauge, anymore.

I should have provided more context for my question. On my first 2 oil changes there is fuel in the oil (https://www.spyderlovers.com/forums...itial-amp-now-2nd-oil-change-analysis-results)
One potential cause is a leaking fuel injector, so I was looking to see how to connect a pressure gauge to see if the pressure is holding after engine shutdown.

I do have a manual and saw the adapter you mention and just wondered if I needed it or not. Sounds like I do. It is available for about $100 CAD.
Thx for your help
Jim

 

[BertRemington]

Actually SS my understanding of my 1330cc fuel system is as follows:

Fuel tank (supply) => Fuel pump => Fuel filter => Y-fitting (left leg) => Y-fitting (front leg) => Fuel rail => Fuel injectors

Fuel tank (return) <= Fuel regulator <= Y-fitting (right leg)

However later models might regulate the fuel pressure electronically in which case there isn't a return line to the gas tank.

RW -- if my understanding is correct for your later model, you would insert your T-fitting with hose ends anywhere in that system. Be careful with the Y-fitting -- it's a bit fragile but you can buy them at an automotive parts store.

 

[Snowbelt Spyder]

Actually SS my understanding of my 1330cc fuel system is as follows:

Fuel tank (supply) => Fuel pump => Fuel filter => Y-fitting (left leg) => Y-fitting (front leg) => Fuel rail => Fuel injectors

Fuel tank (return) <= Fuel regulator <= Y-fitting (right leg)

However later models might regulate the fuel pressure electronically in which case there isn't a return line to the gas tank.

RW -- if my understanding is correct for your later model, you would insert your T-fitting with hose ends anywhere in that system. Be careful with the Y-fitting -- it's a bit fragile but you can buy them at an automotive parts store.

Hey Bert. Looking at the 2014 shop manual diagram, yours is the exact same as mine.

- Fuel pump output from the tank > Fuel filter > Y fitting as the return to the tank > to fuel rail.

This is a semi-return system. The fuel rail on the 1330 is dead ended. There is an inlet, but no outlet. The Y-Fitting constitutes the only return - the purpose of which is to bleed off and return the excess fuel that the pump is putting out, and that the engine is not using. There is only one Y-fitting.

The fuel pressure regulator is a back-pressure type on the return line from the Y-fitting. Thus, the entire circuit is maintained at the same pressure. When the pump is turned off, the pressure in the circuit is "locked-in", to just bleed down gradually. The OP can essentially connect a gauge anywhere in the circuit in order to check for excessive bleed down rate. But, BRP wants to use the existing connection rather that cutting into the fuel line. There does not appear to be any fitting on the fuel rail.

My sense is that you and I are seeing the same thing, understanding the same thing, just saying it differently.

For those historians out there - the Spyder fuel supply used to be a full return system. The 2013 heat recall changed a number of things, among which was to modify the system to a semi-return system. That way, there was less heat carried back to the fuel tank from the engine area. And this turned out to be compatible with the 1330 fuel system. 2012 and earlier 998 machines, as well as the later 998 RS and ST, have a full return system with the pressure regulator at the engine on the fuel rail, and a return line to the tank from there.

Quiz on Friday.

 

[BertRemington]

SS -- yep we're saying the same thing.

Clarification for those watching. The 1330cc fuel circuit has both supply and return before the fuel rail. In my experience with automotive return-type pressure regulators, the return is after the fuel rail. There are advantages and disadvantages to both return types. SS provided history and rationale for BRP's choice.