I have a 1991 Toyota pickup with the 2.4L engine. It would start and idle but would bog when accelerating to about 30 mph and then cruise okay. The fuel pressure was at 10psi vs the usual 50psi. I installed a new Toyota brand fuel regulator and fuel filter, but that did not help. I brought a new fuel pump and then Found the issue at the old fuel pump, the rubber hose from the pump that attaches to the metal line on the fuel pump came off, which I thought was due to a loose hose clamp. I decided to install the new fuel pump with a better hose clamp and all was well for about 2 months when the same bog issue returned. The rubber hose came/blew off again. What would cause the rubber line to blow off? Thanks in advance...

 

Hopefully the piece of hose on the pump is the proper type of hose material. There is a type designed for constant immersion. If you used the piece that often comes with the pumps, you "should" be ok. There is a rubber like damper that goes on the end of the pump that is often missing and it doesn't always come with the new pump. It might allow the pump to move if it's not on and against the bottom of the fuel pump hanger. The spring clamps are usually enough to keep the pump in place so IDK what else could be going on in your tank.

The pump is basically contained between the top and bottom of the pump hanger. If it was running fine, I would make sure you have the correct material hose, new spring clamps and the rubber like "damper" or whatever it is called securely holding you pump in place. Is the hanger bent or anything?

IDK if the pump could build enough pressure to blow the hose off? Fuel pressure varies from 30 something at idle to in the 40's depending on the vacuum to the regulator.

Good luck with it and please follow up with your solution.