7.4 EFI vapor locking

[patty wagon]

I have a 1996 330 Sndancer. Ever scince puting 2 new long blocks in , my port engine will not restart after it sits for about 30 minutes, when hot only. I have replaced all i can at this point. Fuel pumps and lines, injectors, presure valve on rail and more. Has anyone had or heard of this problem?

 

[BarryCF]

Use search for "vapor lock". You should find more info than you will want.

 

[patty wagon]

I have, nothing quite fit my problem. Was hoping someone with similar model had the same problem solved allready. Its very rare with EFI s. Thank You.

 

[carterchapman]

Patty,

I don't have the same model, but I do have a temp gauge in my bilge. I run my blowers 5 min prior to start, while my engines/genny are running, and 15 mins after shutdown. the highest temp I've ever seen in my engine compartment is 109°F - on a 95°F day (the sensor is on top of the engines).

Have you checked your engine room temps?

 

[fc3]

Someone screwed up the install. Recheck that the correct components were used and routed properly.

 

[370Dancer]

So, there's either an epidemic of vapor lock, or it's like buying a black Lexus. Suddenly, they're everywhere......

 

[patty wagon]

When I break open the fuel line going into the electric fuel pump it starts up fine. That releases the vapor. I have also installed another electric fan that i keep running when in use. This has shortened my cool down time. Thank You for your reply.

 

[patty wagon]

I agree! My mechanic, who is unable to figure out the problem does not. Crazy! Thank You for your reply.