Fuel pressure sensor

[Manny1522]

Hey y’all!

Would it be an issue if I want to mount my Fuel pressure sensor upside down?

[ryeguy2006a]

No, it will have no affect on your sensor. I have mine in the same exact position with zero issues. LDM sensors rock!

[Manny1522]

No, it will have no affect on your sensor. I have mine in the same exact position with zero issues. LDM sensors rock!

Awesome! Thanks for the help! I agree about LDM great prices compared to the big name companies!

[ULTM8Z]

Mine is also mounted upside down on my fuel rail for the last 15 years and no issues.

[Manny1522]

Mine is also mounted upside down on my fuel rail for the last 15 years and no issues.

Awesome, thank you

[parsonsj]

I'd add one thing: your sensor will last much longer if you isolate it from engine vibration by mounting it remotely with a bit of hose from the fuel rail. Or, better yet, mount it in the fuel supply line BEFORE it gets to the fuel rails. You'll get a better average value that way as well.

[MAGONSTERZ68]

I'd add one thing: your sensor will last much longer if you isolate it from engine vibration by mounting it remotely with a bit of hose from the fuel rail. Or, better yet, mount it in the fuel supply line BEFORE it gets to the fuel rails. You'll get a better average value that way as well.

Would signal integrity suffer if not mounted on rai? and worsen the further from the point of outlet?

[parsonsj]

Would signal integrity suffer if not mounted on rai? and worsen the further from the point of outlet?

I don't know what you mean by "signal integrity". Do you mean "fidelity"? How close the transmitted value is to the actual value of the fuel pressure? We have a lot of ground to cover to go through what we mean by these terms. Let's assume you mean fidelity.

Fuel pressure is an interesting case because it's a pressurised liquid subject to heat, with small momentary pressure losses due to the injectors dispensing fuel into the engine. So the fuel pressure does vary slightly all through the fuel supply hose, and if you really want to monitor and analyze fuel pressure, you'd need to add sensors all along the way (before and after each injector, along the hose, etc.). You'd need 10-12 high-quality quick-reacting sensors, plus the ability to record all that at around 200 Hz (there's no way any human being can watch all that data) for post-run analysis.

OTOH, if this is just for a fuel pressure gauge for the driver to glance at every now and then or to make sure the engine is getting gas as designed (3 bar, 4 bar, etc.), then it's best practice to put the sensor in the fuel line ahead of the fuel rails, or via a flexible line connected to the fuel rails to minimize vibration.

Hope that makes sense.

[MAGONSTERZ68]

thanks for the specifics, much appreciate detail frame rail it it is.

[icemanrd19]

I used the same sensor and slowed down the sample rate

[MAGONSTERZ68]

I used the same sensor and slowed down the sample rate

Reason behind slowing sample rate?

[icemanrd19]

Easier to see during data logging. Fuel pressure sensor on the fuel rail can change and pick up injector pulsing.

[MAGONSTERZ68]

Easier to see during data logging. Fuel pressure sensor on the fuel rail can change and pick up injector pulsing.

ah, gotcha thx