I'm currently dealing with a vapor lock in my Chevelle, got a rebuilt BBC 427 bored .60 over with 75 miles on the engine, ever since I put the motor in I'm having a fuel issue, I'm running Edelbrock Performer RPM Mechanical 110 GPH fuel pump with a 3/8 steel fuel line from the tank wrapped with rubber hose, today was a humid day here and as the engine temperature went up I was also losing fuel pressure, when the engine reached 200*F idling in the driveway my fuel pressure went down to 0 PSI and the engine shut down.
I do have a Autometer Mechanical liquid-filled fuel pressure gague mounted on my cowl today when my pressure went down to 0psi I took a ice pack and put it over my gauge and it didn't make a difference the car still shut down so I believe the gauge was working,
when I had the car out in my may when the ambient temperature was cooler I didn't have any issues driving around the city, but I had issues on the freeway when the car was revving at 3500RPM and my engine temperature was increasing I was losing pressure and the engine shut down and I had to wait for the motor to cool off, but once I got off the freeway my pressure jumped back up to 4 psi on the streets and I was fine,
this is my 2nd mechanical fuel pump which I thought it was issue, I have my headers wrapped in header wrap, I have all my fuel lines wrapped and I'm running a carb spacer, I'm getting frustrated and losing hope,
I have a 160*F thermostat and when my temps stay around 150-160*F on cooler days the fuel pressure stays steady 4-5 PSI until at WOT when the engine temps increase I start losing pressure
I do have a Autometer Mechanical liquid-filled fuel pressure gague mounted on my cowl today when my pressure went down to 0psi I took a ice pack and put it over my gauge and it didn't make a difference the car still shut down so I believe the gauge was working,
when I had the car out in my may when the ambient temperature was cooler I didn't have any issues driving around the city, but I had issues on the freeway when the car was revving at 3500RPM and my engine temperature was increasing I was losing pressure and the engine shut down and I had to wait for the motor to cool off, but once I got off the freeway my pressure jumped back up to 4 psi on the streets and I was fine,
this is my 2nd mechanical fuel pump which I thought it was issue, I have my headers wrapped in header wrap, I have all my fuel lines wrapped and I'm running a carb spacer, I'm getting frustrated and losing hope,
I have a 160*F thermostat and when my temps stay around 150-160*F on cooler days the fuel pressure stays steady 4-5 PSI until at WOT when the engine temps increase I start losing pressure