Hi Guys
I have a 2000 4.3 gl carbed motor that falls on its face between 2500 -3000 rpm and often stalls, however is does not backfire thru the carb and restarts quickly.
There is no fluctuation on the tach. I have run this motor directly off of a 5 gal gas can with new fuel line. Same issue.
The secondary metering plate on the Holley 4160 was plugged so I rebuilt the carb. Same problem. I have 7 psi fuel pressure at idle but it drops to zero when it acts up.
I have run the fuel pump with a jumper wire between 30 and 87 at the relay cavity and don't see a voltage drop on either the power or ground side at idle. The fuel pump is new. I would expect to see more than o psi at 2500+ at my guage which is teed in between the electric fuel pump and the carb.
Even after returning to idle it takes some time to recover to 7 psi.
I suppose I should monitor the ignition with a timing light flash but can't get over the fuel pressure drop. I also may run the power and ground leads to the fuel pump directly to the battery.
Any help would be greatly appreciated.
Thanks in advance
Jon Allen
I have a 2000 4.3 gl carbed motor that falls on its face between 2500 -3000 rpm and often stalls, however is does not backfire thru the carb and restarts quickly.
There is no fluctuation on the tach. I have run this motor directly off of a 5 gal gas can with new fuel line. Same issue.
The secondary metering plate on the Holley 4160 was plugged so I rebuilt the carb. Same problem. I have 7 psi fuel pressure at idle but it drops to zero when it acts up.
I have run the fuel pump with a jumper wire between 30 and 87 at the relay cavity and don't see a voltage drop on either the power or ground side at idle. The fuel pump is new. I would expect to see more than o psi at 2500+ at my guage which is teed in between the electric fuel pump and the carb.
Even after returning to idle it takes some time to recover to 7 psi.
I suppose I should monitor the ignition with a timing light flash but can't get over the fuel pressure drop. I also may run the power and ground leads to the fuel pump directly to the battery.
Any help would be greatly appreciated.
Thanks in advance
Jon Allen