Can't get Fuel pressure above 5.5 psi

[ERA Chas]

I've had a different experience with my Red pump. Never a vapor lock problem and it feeds a Carter 7 psi mechanical and dead-heads at the dual quad log. No regulator.
Since 1991.

[Tommy]

Originally Posted by ERA Chas

I've had a different experience with my Red pump. Never a vapor lock problem and it feeds a Carter 7 psi mechanical and dead-heads at the dual quad log. No regulator.
Since 1991.

I didn't have trouble with mine either when cruising around town or on cooler days at the track. But on a hot day at the track when it was using a lot of fuel, mine vapor locked coming back into the pits.

[ERA Chas]

Originally Posted by Tommy

I didn't have trouble with mine either when cruising around town or on cooler days at the track. But on a hot day at the track when it was using a lot of fuel, mine vapor locked coming back into the pits.

Just speculating Tommy but how do you know it was the pump? Possibly the line near the carb or the carb itself heat soaked as you were traveling slower than track laps??
My experience is that the electric pumps cooler fuel than the mechanical during hot conditions and I always have a good feed.

[Tommy]

Originally Posted by ERA Chas

Just speculating Tommy but how do you know it was the pump? Possibly the line near the carb or the carb itself heat soaked as you were traveling slower than track laps??
My experience is that the electric pumps cooler fuel than the mechanical during hot conditions and I always have a good feed.

My understanding is this. If fuel in the line or carb float bowl vaporizes, that bubble will be displaced by fuel from a working pump. For example, if fuel in the float bowl vaporizes, the float will fall, the valve will open and the pump will replace the vaporized fuel. It might cause a momentary hiccup, but not a prolonged loss of fuel. When my car stopped in the pits for lack of fuel, I solved the problem by putting ice on the fuel pump for ten minutes or so. I'll add that the problem has not reoccurred since I modified the pump and added the external regulator.