UPDATE3: fuel starvation/loud pump on 83 urq

[Brady Moffatt]

Hi All,

I changed the fuel pump today. Brand spanking new Bosch (no Pierberg around
in stock anywhere). Wow, it's nice working on non-winter-driven cars. No
broken bolts, no rust eye baths, much less swearing. Well, at least until I
went for a test drive.

The really loud old pump that crackled and changed pitch has been replaced
by a new one that does exactly the same thing. That means no power and
stumbling like before.

I'm still pretty sure it's a fuel problem since the O2 voltage drops to 0
when the car stumbles. My worries about the hot coil were unfounded. The
strut bar right next to it is just as hot.

What next? I have a plunger kit on order from the dealer. If it was
sticking, could it reduce pressure enough to close the injectors?

Is there anything else?

Help!

Cheers,
Brady Moffatt
Montreal, Quebec, Canada
83 UrQuattro with 54,000 miles
86 4ksq with 310,000km
86 4ksq parts car
72 Datsun 240Z with 180,000 miles
92 VW Golf with 200,000km FOR SALE
in middle stages of quattrosis accumulatus


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