Diagnosis needed... (also Bosch fuel pump specs)

[Fred Miranda]

I have flowed a few Bosch pumps, but the part #s I have are 9 digit.
ie: 580 254 984 (Porsche turbo I think)
this one flowed 54gph at 42psi, 48gph at 60psi & 45gph at 70psi
the others I flowed had #s ending in: 957 & 959
the 959 flowed 44gph at 60psi and the 957 a few gph less.

Fred

At 04:11 AM 2/20/97 GMT, you wrote:
>Does anyone have the specs for a Bosch GFP-215 pump? It has the 7/16"
>nipple at the inlet and 12 mm female threas on the outlet side.
>	Specifically I'm interested in the flow rate at 60 psi - my
>system seems to be maxed out, although it could be cavitating on the
>inlet side. Car is a BMW 745i (3.5 liter turbo) with 3.0 bar (43 psi)
>nominal pressure, running 15 psi boost (hence 58 psi fuel pressure),
>two extra injectors with a homemade 8748 controller, and a small
>nitrous setup (one 40 hp nozzle).
>	When I take off hard, after about 5-6 seconds, there is a
>_severe_ misfiring that occurs. If I lift somewhat, it catches and
>runs fine. Sometimes I can see the fuel pressure drop very briefly on
>a gauge connected to the rail. I have replaced the stock pump with the
>above Bosch pump (GFP215), and run heavy leads to it since the stock
>wiring was too small. Also I have installed a #6 braided Teflon line
>(.42" ID) from the pump and filter to the rail.
>	I called Kinsler fuel injection for advice. They said my pump
>should be plenty big enough, but that the in-tank transfer pump (rated
>at something like 2 liter/min, which is marginal for 400 hp) might be
>causing a restriction if I was trying to pull more fuel, and to remove
>it. So I did, with basically no improvement.
>	The tank has a 1.5 psi pressure relief valve to the outside air
>(which also can allow air back in to the tank). It is working
>properly.
>	What's interesting is that the volume of fuel contained in the
>new fuel line is just about the amount that would be moved in 6
>seconds or so. This is why I suspect the problem is the pump itself,
>or cavitating at the inlet.
>	Any ideas gratefully received - before I start tearing it (and my
>hair) apart...
>Thanks!
>-Charles
>cmorris at ix.netcom.com
>
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