Wonder if it's fuel related, that happened to my CC turned out to be a Fuel Pump Issues in the gas tank.
The hard start issue appears to have fixed itself though. Starts just as well as it did with the dual pump setup now.
I was able to pull off this conversion on Sunday. Car runs well. Super easy install.
I sold an Airtex fuel pump for a Mk2 GTI that had the factory part number filed off (like the part in the OP), and it had been painted, and you could see where Bosch was printed on it under the paint.
my car had a similar problem, mk2, but still a vw. turns out the relay works killer, my problem was a combination of the main pump going bad and some very very bad corosion in the fuse box.
Love the car, but have just had the fuel pump replaced, driver-side window leak fixed, and a slight metallic rubbing sound related to the brakes(which the techs can't find yet.)
One thing I've noticed with worn fuel pumps is they will still physically operate, but they won't put out the 70psi they're supposed to put out, or their flowrate decreases. In the case of my R32's pump, the flowrate and pressure were significantly decreased, and the load on the circuit was increased. Lots of resistance, overloaded the relay.
If you are buying Airtex pumps, I wouldn't be surprised if they're natural failures. 2 years ago, I installed the first replacement in a 5.7 Ram truck. It lasted 4 months. I replaced it, warrantied part, lasted -3 days-, replaced it again.
I went through 4 Airtex pumps in about 1.5 years in my car. I seriously thought there was a problem with my tank or fuel but it was clean as a whistle in there. Finally upgraded to a Walbro and haven't had an issue since.
No it will NOT work with the current pump....the R32 pump will burn out as the fuel pump controller pulses the pump which burns out the brushes.
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