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Don't rule out the fuel pump based on whirring-
Posted by Wingerr (more from Wingerr) on Thu, 13 Jan 2005 12:04:20
In Reply to: Re: the plan-, wingerr, Wed, 12 Jan 2005 09:54:27
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Looks like it's a mistake to think the fuel pump is still good if you hear it whirring away when it's powered up, the problem I'm having is a low pump output. Cracked open the banjo bolt connection at the fuel rail, and didn't get the geyser I expected, and cranking it showed pretty low volume.
I put an electronic stethescope on the injectors and heard them clicking while cranking, so they're getting the drive signal, so fuel pressure it is.
At the pump, I popped off the outlet connection, ran a hose into it (too bad I don't know where my old check valve is, or it would have been a tidy way to hook up a hose to it), and checked for fuel delivery while cranking. Some fuel came out, but not very much. Couldn't really check pressure since I didn't have a solid connection there; just a big hose stuck down into the pump cover connection.
Reconnected it, then pulled off the inlet connection, cranked it, and zilch came back from the return line, which indicates the pump isn't developing enough pressure to make it past the pressure regulator.
So, I'll have to decide if I want to take a chance and gamble that the pump I need is the common one or the other one, or open it up to confirm it before buying it.
posted by 12.4.27...
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