fuel pump cavitation

[frosty383]

quick question. I have a 260Z with a SBC in it. its a 5 speed, 650 holley DP dual feed with a fuel filter intergrated fuel rail. I have the holley FPR set at 6.5 lbs. I have an external holley blue FP located right in front of the fuel tank with a 90 degree fitting on the tank and a 3/8th" blue hose connected to a cheap autoparts all metal fuel filter in between the fuel tank and the fuel pump. Until now the car was running fine considering I have only driven the car at night but today I drove around in it for about an hour or so. Upon trying to merge onto the highway I gave it full throttle in first and second and noticed that the engine developed a very noticable sputter and cut off. I stoped on the side of the road and tried fireing her back up and nothing. the fuel pump was still powered up and I felt a weird shaking in the fuel hoses leading to the regulator and towards the carb. I let the engine cool down a bit even though the temp guage was a 170 and after 5 minutes she cranked right up. Now on to the question at hand, that weird sputter, I felt while driving at night but not as bad where it would make the motor stumble like it did today. Could it be the rear fuel filter thats inline between the tank and pump?, I ruled out the pump and the FPR because when I got home I opened the hood and while it was idling I gave the throttle a few good blast to 6000 rpms while watch the fuel pressure gauge and it stayed steady at 6.5 PSI.

[drmiller100]

if you are running stock tank you have to keep the tank mostly full or it starves.

the pickup is at the front of the tank,and when you are accelerating the gas sloshes to the back and the pump sucks air.

search "fuel starvation". try running a full tank and see if it still does it.

[jt1]

The shaking is a sign the pump is starving for fuel. I would check the filter, then the pickup if the filter looks OK. I've never had a problem with my stock tank and pickup.

 

jt