I have found the ones in 1hXXX engines (1HD-T, others have found 1HZ) that they dont like air in the fuel. For some reason they spit out a seal and they "do an impressive exxon valdez impersonation" pumping oil out at an alarming rate.

It requires a 20c part to be replaced, but it takes 8 hours to do so. (requires the injector pump to be removed) I removed the CAV filter and replaced it with a toyota one. Perhaps I am an idiot, but the toyota ones are idiotproof.

Apart from that no worries.

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cheers
Chris.
1990 landcruiser 80, 1HD-T two tank, copper pipe HE+ 20 plate FPHE, toyota solenoids and filters. 1978 300D, elsbett one tank system.