Dude just put a different downstream injector on that dewalt. Not pulling soap is not something you need to take the machine to the dealer over.
The injectors on those dewalts are notoriously terrible. Just buy about five injectors from bob at pressure Tek and consider them disposable. When they stop pulling soap toss them out and put on a new one.
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Over the years I have found that as you increase the length of your hose you lose the ability to draw soap from the pump.
I use 40 meters of hose (120 feet). I have a gun mounted venturi that draws soap, I use a 10 meter secondary hose from an enclosed 15L container.
[MENTION=10695]Anolog139[/MENTION] you can definitely set up an 8gpm in a trailer like what you have. and it will be worth it. give me a call, i can walk you through the whole thing. i’m close by anyway so if we need to meet up i’m happy to do that.