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Is it the low pressure or the high pressure?
How long is the longest high pressure line?
If the high pressure chemicals enter at the pump, it makes no difference how they're delivered.
Do the low pressure chemicals tee in at the boom?
What was the fuse for? It might have been the main fuse for the bay. Do you have a Coleman Super Saver?
The only solenoid is the one for the water to the bay. If you disconnect a wire to the coil and the bay runs except without spot free flow, it's the coil.
The timer is probably getting...
They're either a balanced pressure regulator or an unloader which functions in the same way except with a shutoff gun. They don't work on flow, that's why the pressure doesn't fluctuate wildly when you pull and release the trigger.
I only found once that you mentioned that, which was AFTER you called out on your false information that WashWorld service is terrible. There's also this bogus claim:
https://www.carwashforum.com/threads/opinions-on-national-chains-decreasing-business-of-local-washes.22511/#post-182387
I found...
There are water-based and oil-based fragrances. I only buy Fragramatics brand oil based, the cheap stuff separates and gums up the lines and solenoids. I prefer Fragramatics units because they're dead simple. Their shampoo machines have a switch you can toggle so it uses winter spot-remover...
The reason for the pressure drop is because the pump can't maintain flow with the larger tips. If the pump is running fast enough, the pressure would remain the same regardless of the tip.
If they're the plastic rivets, you may be able to get them out. If they're metal, you almost definitely won't.
You'd have to get things really accurate to reuse the holes. I'd be afraid to try. I always have trouble doing stuff like that.
I've been talking to a guy who wants to build a couple truck bays. He already has two, but they have regular 92" booms, so the hoses have to be so long they drag the ground most of the time and the trucks still have to pull forward/back at least once. Is there any sort of boom system out there...