I'd like to install an electronic fuel pressure sensor for logging data with my PFC Datalogit; something simple with a 0-5V output.

I'm thinking this: https://www.reveltronics.com/en/shop/60/6/onboard-computers/oil-fuel-pressure-sensor-150psi-10bar-5v-detail; screw it into a brass barstock tee with two 5/16 barbs and spliced into the factory fuel line.

My question is, where is a good place to splice it in? I can't put it between the secondary rail and the FPR, as the factory FPR bolted directly to the rail.

Now I don't actually know how the FPR work/system circulates, but I'm going to guess the pump probably pumps fuel towards the primary rail inlet, and after passing through the primary rail its outlet connects up to the secondary rail's inlet, and then the FPR at the end of the secondary outlet blocking enough fuel from passing back on the return line to keep the pressure where it's supposed to be. Is that accurate?

I've heard it said that if you can't put a gauge/sensor in between the secondary rail and the FPR, the next best place to put it is in-between the rails. Unfortunately I'm thinking that with my above proposed setup will be too bulky to splice into the line that connects the two rails (https://www.atkinsrotary.com/store/w...-420Detail.jpg). However, it seems as though installing the sensor just before the primary inlet (where there is plenty of room) would be a perfectly good option as well. Any problems with that?

 

For what it's worth, I asked Chris Ott about this and he said they tap into the source hose between the hardlines at the firewall and the primary rail inlet for this purpose all the time.

 

Yeah, I should think that anywhere pre-FPR in the engine bay would do. If you've got an aftermarket FPR than the front is usually tapped for a gauge. If you're logging pressure then I'd assume you could just put your sensor in the FPR instead of a gauge.

 

I plumbed mine in after the firewall similar to...

https://robrobinette.com/fuelp_gauge.htm

 

Be mindful that the logging frequency available on the data datalogit may result in aliasing and lead you down the garden path if chasing harmonic problems with large injectors/no fuel pulsation damper.

 

Thanks for the heads up! That is good to keep in mind.

Now how does the FPD work? Is it only
going to influence the pressure between the the damper and the FPR?