I have a 1980 FJ40 that is keeping me on my toes with gremlins lately.
I have recently (4/20) replaced the electric fuel pump and filter after it just died and wouldn't pump any more. I bought the same cheapo looking "autobest" 42S that the PO had in there, and it seemed to do fine riding around locally on short trips to the grocery store and such. I have also replaced the Weber 3236 with a Weber 3838, and I was absolutely shocked at how much of an upgrade that has been.
Recently, on longer drives I've noticed that out of the blue the truck will start bucking and trying to stall and die like it's not getting enough fuel - usually this happens at the higher RPMs in 3rd gear or when I'm pushing it hard in 4th. This only happens after driving for a while, maybe 20-30 minutes into a trip. I can keep it from dying by pushing in the clutch and letting it slow down before putting it back in gear, usually the lower RPMs in 3rd. Then to get home I basically have to just barely accelerate and play with the clutch to get home.
The truck starts up immediately and there's no coaxing needed from the gas pedal or anything like that. Starts and idles like it was fresh off the assembly line. I'm no carb expert but it seems like everything on there is as it should be - I tightened the two idle air screws all the way in, just barely hand snug and then backed them both out 1.5 turns.
I've combed this forum and found a number of things that could be causing my issue, and I have a friend that has suggested I move my fuel pump as far back to the fuel tank as possible (better pusher than sucker is what I'm seeing a lot of). I had also wondered if it was overheating where it's situated (see attached pic) but it seems like there's plenty of open space and airflow where I have it located. It seems like it's going to be an enormous PITA to relocate it next to or near the tank....
I'm going to put on new plugs, wires, cap and rotor today, just because I have no idea when the PO did that last and I'd like to rule that out.
Also, the hose coming out of the fuel pump goes from a rubber fuel line to a hydro line, then back to a rubber hose before going to the carb. Is there anyway that could be causing thruput issues or is that some kind of hack job done to prevent vapor lock? I attached a picture so you can see what I'm referring to.
I have recently (4/20) replaced the electric fuel pump and filter after it just died and wouldn't pump any more. I bought the same cheapo looking "autobest" 42S that the PO had in there, and it seemed to do fine riding around locally on short trips to the grocery store and such. I have also replaced the Weber 3236 with a Weber 3838, and I was absolutely shocked at how much of an upgrade that has been.
Recently, on longer drives I've noticed that out of the blue the truck will start bucking and trying to stall and die like it's not getting enough fuel - usually this happens at the higher RPMs in 3rd gear or when I'm pushing it hard in 4th. This only happens after driving for a while, maybe 20-30 minutes into a trip. I can keep it from dying by pushing in the clutch and letting it slow down before putting it back in gear, usually the lower RPMs in 3rd. Then to get home I basically have to just barely accelerate and play with the clutch to get home.
The truck starts up immediately and there's no coaxing needed from the gas pedal or anything like that. Starts and idles like it was fresh off the assembly line. I'm no carb expert but it seems like everything on there is as it should be - I tightened the two idle air screws all the way in, just barely hand snug and then backed them both out 1.5 turns.
I've combed this forum and found a number of things that could be causing my issue, and I have a friend that has suggested I move my fuel pump as far back to the fuel tank as possible (better pusher than sucker is what I'm seeing a lot of). I had also wondered if it was overheating where it's situated (see attached pic) but it seems like there's plenty of open space and airflow where I have it located. It seems like it's going to be an enormous PITA to relocate it next to or near the tank....
I'm going to put on new plugs, wires, cap and rotor today, just because I have no idea when the PO did that last and I'd like to rule that out.
Also, the hose coming out of the fuel pump goes from a rubber fuel line to a hydro line, then back to a rubber hose before going to the carb. Is there anyway that could be causing thruput issues or is that some kind of hack job done to prevent vapor lock? I attached a picture so you can see what I'm referring to.
