Truck backfires when it gets up to temperature

CAMERON13255

MEMBER
1991 DODGE DAKOTA
3.9L
6 CYL
2WD
AUTOMATIC
116,000 MILES

I put a new fuel pump onto my truck because the original one would leave me stranded until it felt like working. When I put the new fuel pump on I put a new filter on as well. After I did all that the truck seems to backfire and bog down when I go to accelerate. It doesn't seem to be electrical.

Sunday, June 28th, 2020 AT 4:42 PM

5 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good evening,

Can you test the pressure from the pump? You need to make sure there is sufficient pressure on the system.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Backfiring is usually from a lean running engine.

https://www.2carpros.com/articles/engine-backfires-while-running

Roy

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Sunday, June 28th, 2020 AT 4:55 PM

CAMERON13255

MEMBER
3 POSTS

I can but I honestly don't know how to from the pump. There's no strader valve for an attachment.

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Monday, June 29th, 2020 AT 4:41 PM

ASEMASTER6371

MECHANIC
52,796 POSTS

You need to open the line at the fuel rail from the pump and install the gauge there. When you rent the tester, it has all the instructions for this procedure.

1. Fuel system pressure must first be released before performing this test.
2. Disconnect the 5/16 fuel supply hose from the engine fuel line. Connect fuel system pressure gauge between fuel supply hose and engine fuel line.

Roy

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Monday, June 29th, 2020 AT 4:53 PM

CAMERON13255