Vapor lock

bizkit · Newbie Joined: 29 Feb 2004 Posts: 14 City: Perth

I just found out, after a year, that my fuel pump cooler was suposed to have a check valve added in the line. has anyone got any experience with this solving the problem? i have a 350 mpi, upgraded pumps and bits, im just hoping that this will FIX it, not make it just ok, just not?

streeter · Posted: Mar 09, 2004 5:37 am Post subject:

I've never heard of vapor lock on motors with fuel injection. Typically it occurs on carbureted models when the fuel boils and actually turns to vapor prior to reaching the carb.

This was VERY common with the 70s model Ford pickups. Also seen it on 80s model CC 2001s with the 351s as well. Common fix is rerouting the fuel line away from the source of the heat or insulating it.

Usually the motor will turn over and run fine from a cold start. The vapor lock occurs after the motor is up to operating temp, you kill it and are trying to turn it over again.

I would be surprised if you're getting that situation on a more modern model with fuel injection. Was this motor rebuilt recently?

bizkit · Newbie Joined: 29 Feb 2004 Posts: 14 City: Perth

No, its only 100hrs old

Trash · Newbie Joined: 23 Jul 2003 Posts: 39 City: Winnipeg

My fuel injected Merc 350 MPI engine had vapour lock. To fix it (under warranty) they installed another fuel pump (in addition to the existing one) to keep more of the fuel line pressurized.

It was a 2002

Trash

PimpinD · Addict Joined: 17 Feb 2003 Posts: 785 City: Orlando, FL

my prostar 205 with the chevy 350 tbi engine had that problem. Insulated fuel line and problem was gone

JoeyJojo · Posted: Mar 09, 2004 1:20 pm Post subject:

wrap the fuel line in aluminium foil and put some clothes pins on it. always works with my jeep in mountains when i am hittin a hard trail