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Fuel Pump on time before start

Posted: 2021 Jul 19, 16:35
by Heemie69
When the key is turned on, the fuel pump runs a stock time of about two seconds and then shuts off.

My replacement fuel pressure regulator does not keep the system under pressure after shutoff like a factory piece.

How do I increase the fuel pump run time in CBAZA J4J1 when the key is ON, before I start the engine?

Using Binary Editor.

Thanks!

Heemie ......

Re: Fuel Pump on time before start

Posted: 2021 Jul 19, 19:58
by decipha
stock is 1 sec

thats cuz your regulator is junk

you cant, you have to use tunerpro or ask your strat developer to add it

Re: Fuel Pump on time before start

Posted: 2021 Jul 19, 20:41
by Heemie69
Decipha,

Yes, certainly you are right - the NAPA regulator is junk. You also confirmed my guess that I can't increase the pump run time.

Do the Motorcraft replacement FP regulators have the proper residual pressure valve?

Which aftermarket adjustable FP regulators aren't junk and do have the valve?

Thanks for your assistance Decipha. Your write-ups have helped me get my 398 CI CBAZA truck and 331 CI Mark VII GUF1 dialed in and running smoothly.

Heemie .......

Re: Fuel Pump on time before start

Posted: 2021 Jul 19, 20:59
by dleach1407
the motorcraft regulators hold the pressure although napa parts are usually decent quality, they both should hold pressure. I helped my brother fix an old ford van that wouldnt hold pressure and the hose from the pump to the fuel hat had a hole in it. You also could have something similar going on in the tank.

Re: Fuel Pump on time before start

Posted: 2021 Jul 19, 21:32
by decipha
pre tune info

Re: Fuel Pump on time before start

Posted: 2021 Jul 20, 16:30
by Heemie69
DLeach,

Thanks, my Lincoln Mark VII had a similar problem - a hole in the hose from the pump to the tank hat. I pulled the tank, replaced the hose with the special immersion spec hose and installed a Walbro pump and a BBK adjustable FP regulator. To my wonderment, it still won't hold pressure and I wonder if the expensive BBK regulator doesn't have a residual pressure valve. Or maybe the new pump's residual pressure valve is bad. Other than that, it runs fine.

The truck never misses a beat, but has not had its tank pulled yet, so I can suspect the tank hose, pump valve or the replacement FP regulator.

Therefore, I was trying to band-aid both crappy-starting vehicles with more pump run time before start.

Decipha - Thanks again for your advice; however, I didn't understand "pre-tune info" .....

Heemie .....

Re: Fuel Pump on time before start

Posted: 2021 Jul 22, 10:13
by red5.0fogger
Heemie69 wrote: 2021 Jul 20, 16:30 DLeach,

Thanks, my Lincoln Mark VII had a similar problem - a hole in the hose from the pump to the tank hat. I pulled the tank, replaced the hose with the special immersion spec hose and installed a Walbro pump and a BBK adjustable FP regulator. To my wonderment, it still won't hold pressure and I wonder if the expensive BBK regulator doesn't have a residual pressure valve. Or maybe the new pump's residual pressure valve is bad. Other than that, it runs fine.

The truck never misses a beat, but has not had its tank pulled yet, so I can suspect the tank hose, pump valve or the replacement FP regulator.

Therefore, I was trying to band-aid both crappy-starting vehicles with more pump run time before start.

Decipha - Thanks again for your advice; however, I didn't understand "pre-tune info" .....

Heemie .....
There's a bunch of write ups on the main page efidynotuning.com without "forum" in front of it. Those write ups are full of info that is commonly wondered about. You can get there by clicking homepage also. under listing.

Re: Fuel Pump on time before start

Posted: 2021 Jul 22, 13:02
by decipha
The pre tune info write up specifies kirban regulators if going aftermarket adjustable.

http://www.efidynotuning.com/pre.htm