I have a 1986 Ranger XL 2.9

I've had a problem for a couple months where if I'm driving for about 30 - 45 min. and I come to a stop and try to accelerate again the truck will start to sputter. Sometimes it will suddenly kick in and I can get moving again but only enough so I can pull over. If I came to another stop it's likely it will sputter again and stall completely.

I noticed it was more likely to occur in warmer weather. One odd thing as well is I've noticed when this starts to occur the power steering starts to feel a little weak. Also there's a noticeable whining sound from under the hood near the firewall in front of the driver.

I've had recent tune-ups and oil changes - last time the fuel filter was replaced however was 2 years ago.

Any ideas as to the culprit?

Thanks.

Also, I was looking up fuel pumps online and find two different kinds, one cylinder type and a longer one with wires, which type would I need?