Engine troubles please help

[SuperSam]

I have a 1989 supra saltare with the Pcm 351 in it I just cleaned and rebuilt the carb because my accelerator pump was not pumping the needed gas and put it in the water to test it and now the engine is bogging down. I thought it was the fuel filter so replaced that and it ran well for a short period of time maybe an hour or so with no issues then when trying to increase the throttle it bogs down and can choke out. Thought it might be water in the gas so dumped in a bottle of heet and another new filter but same result drove around for 15 min fine then it started to bog down and then u couldn't go faster then an idle in gear with out it wanting to die. What really confuses me is that it runs great in neutral and never chokes or bogs in reverse and so I'm confused if it was gas wouldn't reverse be affected or does it only use a limited amount of gas in reverse so the restriction of gas doesn't affect it. Anyone that can help would be appreciated I am about to bring it to a shop cause idk what to do

[Cusefan78]

Well I would go back to the carb. Take it off and make sure everything is set correctly. Also make sure all the passages are clean

[michael hunter]

What was it doing before you rebuilt the carb?

[wotan2525]

Try to run it off of a aux. plastic gas tank instead of your fuel tank. Sounds like bad gas to me.

[Zim]

Could be debris in your tank also thats getting washed around as you're moving, and then starts clogging up the fuel pickup after a while choking the fuel supply. Have you checked the filter since you replaced it?

[SuperSam]

The reason I rebuilt it was because it was backfiring when throttled and I thought the accelerator pump was not functioning. It was also bogging down before so I was thinking the rebuild would fix both. I have replaced the fuel filter again and it had particles but didnt think.it was enough to.clog a brand new filter but I replaced it again anyways. I have not emptiex my tank of gas anx checked it. Was hoping the heet would take care of the gas but obviously it didnt. Any suggestions how to clean the tank I will have to take out the ski locker today and pump the fuel out. Im not super mechanical so I am trying not to tear it all apart but I am learning as I go so all advice is much appreciated.

[SuperSam]

I still wonder why I can go in reverse as fast as I want and it doesnt choke out but when I put it in forward it does once I throttle it a little. Anyone have any ideas? Does it not take as much gas in reverse or would that mean its not a clogged tank or bad gas?

[Cusefan78]

I still think you have something up with the carb. Did you set the screws properly could be not getting enough gas to throttle it up. Reverse gear has less friction plates so it will go faster in reverse with less power. A few particles in the filter isn't going to clog it.

[SuperSam]

Played with the mixture screws didnt change anything... was told by a carb specialist that if it was the carb he wouldnt think that it wouldn't run fine for a short period of time and then clog if it was clogging the jets would clog within the first 30 sec because of all the fuel it would be sucking not after 15 min to an hour... he thought fuel or exhaust... as we speak I have been emptying the gas tank and am gonna try and clean it I do see particles but not an alarming amount. Is there a good way to clean it? Is there a filter in the tank? I got the float hole open and have been working through that but not a lot of room to work to clean it.

[cadunkle]

When it is acting up when trying to give it throttle pull the air cleaner off and manually work the accelerator pump lever. You should see a crisp stream of fuel out of the accelerator pump discharge nozzles hitting the boosters. If nothing you have a bad accelerator pump check valve or plugged passage. A failed diaphragm normally results in an external fuel leak. If you have a weak dribbly spray you may have a partially clogged passage or discharge nozzle, or the metal gasket at the top and bottom of discharge nozzle is not sealing.

If you VERY slowly open the throttle does it still bog? Lack of fuel is more of a stumble or misfire. A bog is just lack of power or smoothly crapping out. Stumble is lean, bog is rich. Which do you have? What you describe sounds more like it would be a lean stumble related to the accelerator pump not working properly or just delivering insufficient fuel when opening the throttle.