MSefi.com read only forum (Jan.15,2018)

I am using an aeromotive unit #13301. After the fuel pump starts right (Up to 43 psi) before I crank it it shuts off and the pressure drops down to nothing in about 1 minute. Should it 'bleed" down? Is that typical? What units are you guys using for regulators?

Also are you guys boost referencing your regulators?


13301 - Universal Bypass Regulator
13301 - Universal Bypass RegulatorSKU: 13301
A dual purpose, universal regulator for EFI or Carbureted and street or strip applications. Base pressure adjustable from 3 to 20 PSI with standard spring, (installed) or from 20 to 60 PSI with high pressure spring (included). Offers the full flow and rock steady fuel pressure that only a dynamic, Aeromotive bypass regulator provides.

• Capable of regulating any fuel pump between 100 and 250 GPH.
• Fuel pressure rises on a 1:1 ratio when referencing boost.
• All ports are 3/8” NPT, with one inlet and three outlets on the main body and one return port on the bottom.
• Bypass design provides the ultimate, dynamic fuel pressure control.
Note: (Requires a return line to be installed from the bottom of the regulator to the top of the tank.)

I am getting an over rich condition at 12 psi boost also and was wondering If this regulator may be the problem as well?

I've seen a couple aftermarket regulators that bleed down like that after you shut the pump off. Ones that bleed down almost instantly are trouble, and often are a sign it won't hold pressure. But if it holds pressure OK with the engine running, I wouldn't worry about it.