Ohhhhh. Yeah its either pump, in tank line, injectors, or regulator. I don't know if anything exists but I would say buy/make a testing setup with a shut off so you can find the actual problem instead of doing a band aid. Something like a quick connect to go on the feed line with a shut off and gauge ports on either side of it. Should help isolate where the issue is and be somewhat inexpensive. Someone will probably have a better idea or an amazon link shortly
