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If you can, either check the fuel pressure or have it checked by a REPUTABLE Mechanic at the rail using the schrader valve while the car is running. It should be regulated to somewhere in the close neighborhood of 35 PSI.
I would think that a weak fuel pump on the verge of quttting would result in a stumble caused by fuel starvation when you accelerate.
Is yours a single in tank fuel pump (a.k.a. Regina System).
There is also a "sock" on the intake tube of the fuel pump that is immersed in the fuel tank - this can get clogged over time. The "sock" -also known as a filter, can be changed independently of the pump. It is located at the bottom of the Sender Assembly in the tank.
Check the fuel pressure at the rail. I would think if you rev the engine with a gauge on the rail and you see markedly noticeable a DROP in pressure when the engine calls for more fuel, replace the pump. Buy the pump from a thrdr party (i.e. FCP - somewhere else) don't pay more than 105.00 for that little pump IF you do replace it - otherwise you are getting robbed.
The FAQs have excellent instructions for replacing the in tank pump. If you do need to replace the pump, follow the directions in the FAQ VERBATIM and you will not have a lot of problems.
You may have a different problem but, if you find out your fuel pump is weakened, and you can confirm it, replace the in tank pump. You need (a) regulated pressure at about 35 PSI and (b) a constant flow out of the pump at the same pressure level to determine if the problem is with the fuel supply to the rail.
I hope this helps.
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