Tell me about Vaporlocking

Pinkston

Well-Known Member
Joined
Mar 21, 2005
Location
Mebane, NC
I am running a TBI 305 in my trooper with a afordable fuel injection wiring harness and chip. It ran fine with just a slight stumble off idle at times.

I just added a summit fuel cell and e2000 fuel pump. This is the fuel cell, http://store.summitracing.com/partd...4294839036+400304+4294920243+115&autoview=sku

Since this change after the motor gets up to temp it starts to stummble bad under a load. I can get the rpms up in neutral, but in gear it stubbles and surges. It also becomes hard to crank like it has drained the battery.

After a little searching and reading it sounds like its vaporlocking. Besides hear are there any other causes of vaporlocking? The fuel lines are the exact same at the motor, the new pump and filter are back near the fuel cell. Fuel lines are on the passenger side frame and exhaust is on the drivers side.

Any ideas?
 
I vaporlocked the Chevy CPI 4.3 vortec in the Jeep I used to have. One thing I did was to wrap the fuel lines in heat shield tape. The other thing I did was fix the exhaust leak that was blowing hot exhaust on the fuel line.
 
I am just regurgitating stuff I have heard/read, but doesn't a TBI unit only take like 10-15 psi of fuel pressure? An E-2000 puts out much more, like probably 45-60 psi, because that is the pump that is commonly used on multipoint EFI setups that require the higher pressure. I am running the E-2000 on my 1.6 16v motor in my Sami, and the 5.0 HO motor in my cab truck.
 
You are right, a TBI system only needs about 15 psi. There is a regulator inside the throttle body itself. I have a inline gauge/regulator on the way to see what the pump is really putting out. The e2000 pump seems to work fine. The issue is only when the motor gets up to 190* or so.
 
had the same problem with my 258 and Howell tbi make sure your inlet restriction is low
i found the sock in tank stooped up
i see you replaced tank make sure no lines are kinked are collapsing
 
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