Originally Posted by
erik88lr
My Landy has symptoms similar to the OP's - runs out of fuel at high speed/load.
Fuel pressure varies between zero and ˝ psi. I've gone through three replacement pumps, new filter, new screen on the pickup tube, new carb float, checked cam lobe, etc. I've put an electric pump inline between the tank and mechanical pump. It puts out 2˝ psi and when switched on stops the bucking at high speed/load.
I don't want to rely on the electric pump, but can't seem to make a mechanical pump work. Don't know if a pump for a later 2˝ liter engine would work any better. It's frustrating that I've not had this problem for the first 25 years, but for the last year or so I've been pulling my hair out...
~erik~
This is not a slam on RN as I buy a pile of parts from them, but their aftermarket fuel pumps are not great. I have been through several that just won't deliver enough fuel to keep the truck running at speed……pretty much exactly like what you all describe.
Find a nice original AC fuel pump and you should be good. There are several vendors state side that you should be able to pick one up from.
1969 IIA - Tan
1969 IIA - Blue