Walboro Ti Automotive Fuel Pump PWM Setup

Battling failing fuel pumps, I take a chance on using pulse width modulation to reduce fuel pump speed to help reduce heat and extend pump life expectancy.

[champspec]

I would also suggest running one pump full time and the other to kick in via pwm or or switch based on MAP or MAF load signal from the ecu. This is a more reliable setup and less prone to failure. More importantly, This will help keep your pressure at a more consistent range.

[RECON]

Awesome Video Brother - BTW according to Walbro ....The controller requires a squarewave frequency (battery voltage to ground) at 100Hz.

[fjs]

Most of those SSR's don't allow True PWM, it's more of a opto-coupled messy square wave duty cycle. It would be nice if they made a SSR with a I2C or SPI serial interface for that. That said, it should still work with a intermittent duty cycle though it might be a lot of stress on the pump's motor.

[Russpeed]

U do know that in the z32 300zx tt as well as the aristo with the gte vvti among other cars I guess, there is a fuel computer which runs the pump at 9volts under normal and then 12 volts when triggered by say boost pressure and possibly other inputs. I am not too confident o on off on off. Arcing unecessarily

[champspec]

Are you sure that you aren’t losing pressure inside the tank? I’ve seen those rubber lines(even the submersible rated) rubber hoses get soft after a short while or shrink enough to lose pressure from the hose clamps in the tank… alot of the time, it only will show up under load. I always use the plastic corrugated stuff with the squeeze type clamps for inside the tanks…. Just something to consider for you possible pressure loss issues.

[Jamxknife]

I recently got a pd16, I’m thinking of trying this but I hear people say brushed walbros aren’t meant to be pwm. How is this holding up for you 2 years later?

[Jakedelus]

I have searching different solid state relays and all off them accept duty only up to 90% not 100%. this means with solid state relay i lose 10% off pump capacity. or am i wrong?

[GTRliffe]

feed size will also extend pump life

i went from -6 too -8 and my fuel temp decreased

step it down at the rail

there are too many bends too leave the line -6

[dubbleA]

Hey thanks for your video, I am trying to do something similar with an electric water pump for my Fueltech.

For the Haltech is the output you are using for the fuel pump send 0v or 12v.
In my situation to get PWM the ECU needs to send 12v. Seems like the Haltech is sending ground in your situation since you didn't mention any grounds in your SSR setup

[davyhay]

I know the EKP modules in BMW cars operate the fuel pumps up to 2khz.

[bmshahsmachineshop]

Does the fuel pump sound louder at less than 100%? Does it also vibrate more as it is pulsing?