Noisy Aeromotive FPR

[Timeless]

Recently my Aeromotive FPR starting whining at idle and sometimes while driving. Engine runs great and AFR is spot in with zero hiccups. Thought it could be cavitation so I installed DEI insulation to the fuel lines near the engine. Inspected the FPR diaphragm and it looks fine but replaced it since I had a new one. Pressure is ~29-33psi at idle.

Is the noise caused by the fact that it is a return less system? The noise popped up about a year ago then went away until recently returning.

- DMCH stage 2 engine | automatic
- Holley Terminator X ECU
- Bosch 62545 injectors
- DMC modern fuel pump
- DMC replacement fuel accumulator in 2023 before EFI
- Factory spec ignition
- always run 93 octane

IMG_6112.jpgIMG_6113.jpg

[Bitsyncmaster]

Interesting you have a non return pressure regulator. Do you have something to limit the fuel pump pressure. My fuel pump blocked is over 100 PSI.

[Timeless]

I do not besides the regulator.

[Bitsyncmaster]

I do not besides the regulator.

I would think that puts a lot of heating and wear on the fuel pump. I would think you need a pressure regulator (return type) at the pump. Or a PWM fuel pump controller. Probably would set either of those at around 50 PSI.

[FABombjoy]

Returnless? I see inlet (left), outlet (bottom), and vac reference (right)

Post a video of the noise. I had a noise issue with my Aeromotive which was definitely cavitation. It took a revisit of all pressure side fitting choices to cure.

[Josh]

It appears the FPR is on the return side (after) the rails. This is an ideal setup. You only need the three port regulator if you are deadheading to the rails.

fuel_pressure_regulator_location_1024x1024.jpg

[Bitsyncmaster]

It appears the FPR is on the return side (after) the rails. This is an ideal setup. You only need the three port regulator if you are deadheading to the rails.

fuel_pressure_regulator_location_1024x1024.jpg

That makes sense and is a great way to regulate pressure.

The original post said "Is the noise caused by the fact that it is a return less system?" That's what made me think "how".

[FABombjoy]

This is what mine sounded like after a 3 hour summer highway drive. Engine is off, this is just the fuel pump running.
Adding cool fuel immediately eliminated the noise.

I added insulation between the coolant pipes and fuel tank, then removed a bunch of angle fittings in the feed line to reduce friction losses. That seemed to do the trick.

https://www.youtube.com/watch?v=O97W7CLuAAg

[Timeless]

I'll get a video when I can. Returnless: typo. Regulator is on the return side as the photo shows.
Even during some cooler evenings here (55-65F) it still whines.

[Timeless]

Difficult to hear over the engine. The whining is much louder inside the car even with the latest addition of a rubber isolator on the FPR mount.
This was at ~80F with 45% humidity with engine at operating temp after a drive.

https://drive.google.com/file/d/1Dqe...usp=drive_link