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I knocked out the glass ball in the return valve two years ago and installed a small fuel filter to catch all "coffee grinds". I made over 15k miles with that setup, 10k on WMO, so definitely the injector clogging was due to WMO. It would be great if some of the guys, who run their trucks on...

Yup, I'd had to remove a couple of injectors to extract swollen GPs and then the injectors looked OK. That was before I started running the truck on WMO mixture. Couple of months into using WMO the truck substantially lost the power, but having had problems with the clogging of IP return valve...

I don't know where the wife got the ultrasonic cleaner, she uses it to clean the jewelry (hope she does not find out I'd used it :-P)...there are some on ebay from $20 upward.... Mixed WMO with red diesel/heating oil approximately 50%/50%, filtered through an old fuel filter. I run the mixture...

I removed and cleaned the injectors. Used a small ultrasonic cleaner, engine degreaser and isopropyl alcohol. I'm delighted with the result, the truck runs much quieter and has noticeably more power. I'll never run it on WMO again. You can see before and after pictures. Also replaced rotting...

just cleaned the check valve for the third time in five days:drool:, next time I'll knock it out.......