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I've never heard of the fuel pump ever being replaced as maintenance. My E30 318i had 370k on it when finally sold it and it was the original fuel pump. My other E30's high 200k's original fuel pump. Maybe the E34's have issues, because I did replace a fuel pump each on our 530i and 525it.
BEST PRACTICE for fuel pump preventative maintenance. Good gas, and avoid frequently going below 1/4 tank. The fuel acts as a coolant for the pump. Additionally, if it frequently is run near empty, fuel starvation/sucking air causes cavitation which damages the pump.
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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i
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