I think my fuel pump is on its way out and since I'm doing a m30 swap, I was wondering if it was worth upgrading the fuel pump for the larger engine. Has anyone heard or know of any good upgrades or is the stock fuel pump sufficient. I only have 1 pump (1990 325i).
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The pump from the E30 325i will be sufficient. As an example I heard of one who ran with a 3.0 bar regulator + 0.9 bar forced induction (3.9 bar effective fuel pressure): he had 320 hp (injectors 366cc @ 3.0 bar).
So there is no point in upgrading the pump, you can get another one just like it. But with some work you could replace the in-tank pump with one of the cheap Walbro 255 ltr/h pumps:
/Mattias
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The external main pump is the same on all the m30 and e30 cars( minus the newer 88 up e30's) So there is no real point to upgrade unless you can get a new after market pump for cheaper. Then I'd go for it.85 325e 2.7 ITB'd stroker
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