I had that problem
I ordered a new fuel pump after an engine rebuild. I was having all sorts of fuel starvation problems with the new pump. I determined that it was bad and traded it in THREE times and got bad pumps each time. This was with a reputable land rover part house. I ended up putting my old pump on and its still running fine.
I think there was a large batch of bad fuel pumps and that some are still out there. I was running a weber two barrrel so my fuel use may have been more than stock.
1968 Land Rover "Park Ranger" camper **SOLD**
1967 109 **SOLD**
NADA Dormobile #601 **SOLD**
1965 IIA 88 2.5NA Diesel
1963 Mercedes 300se
1975 Volvo C303
KJ6AQK