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TurboKraft TurboKraft is offline
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Join Date: Mar 2005
Location: Phoenix, AZ
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Fuel pumps

Sorry to hear about your fuel troubles.

We're typically running the stock 930 pumps on our EFI conversions, no issues other than they're just getting old. 930s are 21-34 years old by now -- I figure if a pump's lasted that long, you got your money's worth, right?

And if the pumps fail, it's more cost effective to replace with new genuine Bosch -044 pumps (there are some knock-offs on eBay).

Wiring and relays also require scrutiny. They're just as old as the pumps, and we've seen several '80s 930s lately that could stand to get a new chassis harness because stock wires were getting brittle.

FWIW, we've used fuel pressure as an input condition in the EFI, i.e. monitor fuel pressure rising with manifold pressure, and if fuel pressure decreases then "X" (open wastegate solenoid, pull timing, increase injector duty cycle -- whatever your strategy). It's just another layer of making it as fail-safe as possible. Maybe your EFI system has this capability?

Another thing we've found from logging is that the stock pumps easily support more than 500rwhp. We monitored pressure on the last EFI Twin Turbo and there was no shortage of fuel pressure during repeated 650awhp dyno runs.

Cheers,
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Old 03-05-2010, 02:38 PM
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