Author Topic: Shut down  (Read 535 times)

wiljoe765

  • Newbie
  • *
  • Posts: 11
    • View Profile
Shut down
« on: June 05, 2018, 11:40:58 AM »
I bought a 69 Camaro in March with a Big block motor and a FAST fuel injection setup. Car also has Vintage AC. The problem is when using AC the car wil lose fuel pressure as indicated on the hand held display and die. Coolant temperature runs 200-210. If I let it set and cool for about 20 min. it starts and runs fine without AC. What am I looking for? Thanks

cook_dw

  • Hero Member
  • *****
  • Posts: 2666
    • View Profile
Re: Shut down
« Reply #1 on: June 05, 2018, 01:27:40 PM »
What am I looking for? Thanks


Hopefully the phone number to FAST to see if they have any suggestions.  I would start with looking at the wiring.  If you don't feel comfortable with messing with it then I would suggest seeking out a reputable shop in your area.
Darrell Cook


If you have a 68 L78 or Z28 Camaro please contact me so I can add your vehicle to my database.

JKZ27

  • Hero Member
  • *****
  • Posts: 513
    • View Profile
Re: Shut down
« Reply #2 on: June 06, 2018, 01:00:42 AM »
Sounds like the A/C system and/or fans is robbing power from the fuel pump. Make sure there is adequate sized wire for each of the circuits, possibly from circuit breakers or a separate fuse block close to the battery. I guess those are the first things I'd check.
John
69 RS/SS Cortez Silver, L48 MC1
68 RS Ash/Ivy Gold 327EFI M20

69Z28-RS

  • Hero Member
  • *****
  • Posts: 4782
  • owner since 4-Apr-1976
    • View Profile
Re: Shut down
« Reply #3 on: June 06, 2018, 01:39:40 AM »
If he is using electric fans on a VA system they can pull a LOT of current; more than probably a 37A alternator can put out!
The FI pump probably draws a bit as well, so that would be my guess as well...
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

KevinW

  • Hero Member
  • *****
  • Posts: 642
    • View Profile
Re: Shut down
« Reply #4 on: June 06, 2018, 10:49:24 AM »
I had a similar problem with amps using an original 37A alt and a big stereo.  Running the stereo would drain the battery at idle an low speeds, because the alt is not putting out many amps at low speeds.  I took my alt to a local rebuilder and they install 100A guts in my original case. That fixed the issue!

wiljoe765

  • Newbie
  • *
  • Posts: 11
    • View Profile
Re: Shut down
« Reply #5 on: June 06, 2018, 06:06:56 PM »
Not using electric fans. Seems to be heat related. Are there any safety shut downs in this system?

Charley

  • Hero Member
  • *****
  • Posts: 523
    • View Profile
Re: Shut down
« Reply #6 on: June 06, 2018, 06:40:10 PM »
What fuel pump and where is it located ?

wiljoe765

  • Newbie
  • *
  • Posts: 11
    • View Profile
Re: Shut down
« Reply #7 on: June 07, 2018, 11:00:21 AM »
Pump is in the tank. Donít know much about it. I moved a fuel pump relay in the harness away from the exhaust yesterday then drove the car with AC on for about 30 miles and had no problems. Iím hopeful that this is the cure.