Bypass regulator expert?

[EL5DEMON340]

Do bypass regulators bleed off fuel pressure when the engine and electric pump is off? Reason I ask is I have a heat soak restart issue and I know it will help cool fuel make it to the carb if it’s plumbed after the carb but if it doesn’t release pressure in the line at shut down i may be better off with a bypass fuel filter. thanks

 

[jbc426]

Do bypass regulators bleed off fuel pressure when the engine and electric pump is off? Reason I ask is I have a heat soak restart issue and I know it will help cool fuel make it to the carb if it’s plumbed after the carb but if it doesn’t release pressure in the line at shut down i may be better off with a bypass fuel filter. thanks

Do you have a full bypass return or a deadhead return set-up?

See here for more info.

Fuel Delivery 101 - VaporWorx

www.vaporworx.com

 

[EL5DEMON340]

Do you have a full bypass return or a deadhead return set-up?

See here for more info.

http://[URL]https://www.vaporworx.com/resources/fds/1-fuel-delivery-101/

[/URL]

I have a dead head now but purchased a bypass

 

[jbc426]

I have a dead head now but purchased a bypass

The regulator uses fuel pressure to either bypass or not beyond a certain adjustment setting. There is no electrical function in the regulator. Most fuel systems don't have a one way valve to hold previously pressurized fuel in your high pressure side of the fuel circuit.

My factory Magnum JTEK ECU runs the fuel pump for a second or so when the ignition key is turned to the on position just prior to cranking or Start 2 to "prime" the pressure side of the fuel system for start up.

Insulating your fuel lines around hot engine parts, blocking off the heat crossover in your intake and using a phenalic or wood carb spacer in combination to running your fuel pump prior to cranking will all help your hot start issue.

 

[Bewy]

The best fix is to use an elec pump on it's own. Carters are best, no reg reqd with the #4594 good for 600 hp. The 4600 is for higher hp.

 

[MadScientistMat]

Most OEM bypass regulators don't (not aware of any case when these were used with a carb, generally an EFI thing). Many aftermarket bypass regulators do, as they trade maybe a longer starting time for the ability to regulate a higher volume fuel pump.