Aeromotive Eliminator Fuel Pump Install

Eric

Owner
Staff member
Backstory- My holley 12-1800 died, and I needed a replacement which could handle the occasional trip to work.

The shop which I purchased the 12-1800 from, was able to swap me out a new eliminator fuel pump.

After fully reading the documentation and requirements for the new pump, I determined I would need to add a sump to my existing fuel tank, upgrade some of the lines to -12AN, and implement a system for PWM control during normal driving.

Parts list for installing the sump.

Parts.jpg


The sump was made from a piece of my broken driveshaft. By my math, it should hold plenty of fuel during heavy acceleration or turning.

The welds are not at all pretty- I had to make 3 or 4 passes to ensure it was completely air tight.

(What isn't pictured- the two attempts of me discovering fuel was leaking from a pinhole, or me having to cut the bung off and start over, because I nicked the mating end.)
Welded Up.jpg
 

Eric

Owner
Staff member
For the PWM setup, I made a simple, stupid table in the holley EFI.

Basically, under moderate throttle, or boost, the pump goes to 100%.

PWM_Config.png


For parts, You will need a solid state relay, and a flyback diode.

PWM_Parts.png


The solid state relay is important- A normal relay isn't meant to switch a PWM signal.

The flyback diode is also very important- It keeps the inductance from the pump from frying your solid state relay.

At the current time, I am using this relay:


One note- check whether your relay is normally open, or normally closed. In my case- this one is normally open. So, a 100% PWM signal, turns the pump off. 0% PWM signal, is max.

For the flyback diode, I used one of these:


It is wired from the Pump (+) to the (-) terminal. When a large spike is created from the pump spinning down, it "eats" the excess current.

I did not remember to take pictures of the wiring diagram, or the wiring.
 

Eric

Owner
Staff member
So far- this setup has been in place for a while, and I have had zero issues, even after driving this 60 miles round trip to work a few times.

Just make sure the solid state relay is mounted where it can get fresh air! It gets hot.
 
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