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Discussion Starter #1
First, I have two ECMs
One stock and one (older model) with a stage one tune.

The stock ECM makes the engine "chugg" when idling, but not all the time. It will be idling fine, then chugg for a few seconds then clear up again. Runs perfectly fine other wise.

The other ECM with stage 1 tune dosent do the idle chugging but shows the fuel tank at 1/2 when it's actually full. It will read correctly below 1/2 tank.

My questions:
Are the injector drivers going bad in the stock ECM, and
On XWD with saddle tanks what's the logic for the aux fuel pump to transfer fuel

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