Hot soak issue

j-mccar3 · 07-16-2009, 01:10 PM

Hi I am new to Pelican forums, but I have a 911 problem. I picked up a 74 911, supposed to be a 2.7 fI. The issue I have is after it is run for a little while and shut off it will not restart. When it does start It acts as though it is flooded or vapor locked. When this happens it has spark, and fuel, it also sprays fuel out of the injectors whenever the key is on. ( I assume this isn't right) So far I have replaced all the intake boots, plugs and points and cleaned the injectors. The car has been molested by the previous owners, there is pecker tracks everywere. If anybody can point me in the right direction I would appreciate it. Thanks in advance. Jamie

kodioneill · kodioneill's Garage

Use the search function and you will fins loads of stuff to help. Most likely it's the fuel accumulator that is at fault.

j-mccar3 · 07-16-2009, 01:37 PM

thanks for your help

Gogar · 07-16-2009, 02:14 PM

The fuel pump in 1974 is on the trailing arm in the rear-left of the car. When the engine gets warm, hot air from the heater system blows directly on the fuel pump. When you stop for a while, usually the fuel vaporizes in the lines down there and makes for a difficult start. That's why they moved the fuel pump to the front of the car in 1976. The check valve after the pump and the accumulator are supposed to keep pressure up, but sometimes heat wins.

Your injectors should spray when you lift the sensor plate behind the air filter, but as far as I know they shouldn't spray all the time.

j-mccar3 · 07-16-2009, 05:01 PM

Thanks for your help, It sounds like I was heading in the right direction. Now all I have to do is trouble shout the CIS.

ossiblue · 07-17-2009, 07:15 AM

Quote:

Originally Posted by Gogar

The fuel pump in 1974 is on the trailing arm in the rear-left of the car. When the engine gets warm, hot air from the heater system blows directly on the fuel pump. When you stop for a while, usually the fuel vaporizes in the lines down there and makes for a difficult start. That's why they moved the fuel pump to the front of the car in 1976. The check valve after the pump and the accumulator are supposed to keep pressure up, but sometimes heat wins.

Your injectors should spray when you lift the sensor plate behind the air filter, but as far as I know they shouldn't spray all the time.

+1
Gogar has pretty much nailed it down. One critical area is the fuel spraying you mentioned. Are you certain the injectors are spraying with the key on? On the 74, the fuel pump will go on with the turning of the key, but no fuel will be injected until vacuum in the intake (due to cranking of the engine) raises the lever in the plenum as Gogar said. If, in fact, your injectors are spraying without the engine turning, take care of that problem immediately!

Sounds like you may have several issues, but none are insurmountable. Lots of help here so keep us up to date on what you find.