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.

 

Could the issue be the fuel line return hose is clogged, its the line that runs from the fuel regulator to the fuel tank.
I did an AI search/question on what could cause the in tank fuel pump rubber hose to blow off and got:
"A clogged fuel return line causes excessive fuel pressure, leading to engine flooding, rough idling, stalling, and severe fuel odor.
The blockage restricts excess fuel from returning to the tank, causing pressure to spike, which can force fuel past injectors and
damage the fuel system, ultimately creating rich running conditions and poor performance"

 

I guess it could if the pump can generate enough pressure to blow the hose off. Didn't you say you checked the fuel pressure? Was it really high?

The return lines are mostly steel with sections of rubber hose to connect. There are just spring clamps since it's relatively low pressure on the return. (Just down stream of the regulator) I'd think it would blow one of those off before the pressure side of the pump?? Needs to be open regardless so you may as well check it. Check your vent line too.

 

Is Mr. Ai some Japanese guy?

If OP checked the fuel pressure, he almost certainly checked it at the fuel rail, not at the pump. If there is a blockage in the line (say, around the fuel filter), at ordinary fuel flow rates the pump would have to hit a much higher pressure to get 33psi at the rail. And that higher pressure could blow off the hose at the pump.

You could try disconnecting the fuel line at the engine, and then try blowing air from the pump. The filter alone shouldn't cause TOO much resistance. Just remember that you'll have to replace the crush washers at the banjo fittings on the engine; they're one-time-use.

 

I had similar bogging for a day then the truck died. The fuel pump hose in the tank came off. Turns out when the pump was replaced by a garage 8 years earlier they never put on a hose clamp. I bought a new fuel pump as had no clue it was just the hose. Had a mobile mechanic install it who said he always adds a 2nd clamp. Now it's been 10 years and still good.