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Before spending heaps of money on pumps and bits you could try some injector cleaner straight into the pump feed, It's a bit tricky but I've carefully blended this into mine using fittings I had previously put into the post filter fuel line for other reasons, rigged the can up to the fitting and watched it blend into the fuel being sucked in by the IP, then shutting the valve before it runs out and the pump starts top suck air.

I didn't do this in response to a problem, I tried it probably 20,000k ago just to give things a clean out.

Don't forget that if you have your EGR blocked your idle will be smellier/richer.

Ball Valve on Fuel Filter outlet, also very handy for bleeding post filter change (don't worry about the other junk on there that's another story).

Fuel line Auto part Engine Tire Automotive tire
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