Fuel Pump

JAYSON.WAGNER

MEMBER
2002 ISUZU RODEO
4 CYL
2WD
AUTOMATIC
150,000 MILES

I tested the fuel pressure using a test kit. Registered at 40psi, stepped on the gas then the pressure dropped to 33psi. I changed the fuel filter.

Recommendations on replacement brand/type, etc?

Tuesday, February 22nd, 2011 AT 8:56 PM

6 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

The pressure spec for this engine is 41 to 55PSI and should NEVER go below that. The pressure should actually increase when accelerating. It appears you have a bad fuel pump.

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Tuesday, February 22nd, 2011 AT 10:32 PM

JAYSON.WAGNER

MEMBER
4 POSTS

Wrenchtech,

Thanks for the reply!

I took the advice and replaced the fuel pump. Then tested the fuel pressure again. Registered at 42psi and increased to 48psi when I stepped on the gas. Thought the problem was fixed but took it for a test drive around the block and the vehicle has the same issues. Top speed of 10mpg, stuttering, bogs down when I step on the gas, check engine light on, then she died on me. I sat there for a few mins and then it started again. It's feels like it's a fuel line/pressure issue but could it be something else? Any advice with this is greatly appreciated!

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Thursday, February 24th, 2011 AT 2:14 PM

WRENCHTECH

MECHANIC
20,757 POSTS

What is the code number being stored from the check engine light?

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Thursday, February 24th, 2011 AT 2:15 PM

JAYSON.WAGNER

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4 POSTS

I have a scanner coming tomorrow and I let you know. I need a day off from this. Thanks wrenchtech.

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Thursday, February 24th, 2011 AT 2:26 PM

JAYSON.WAGNER

MEMBER
4 POSTS

Wrenchtech. The code came up as "#2 cylinder misfire" and I knew that wasn't the issue so I ended up bringing it in for a professional diagnostic test. Catolytic converter was the issue. She runs like a dream now. Thanks for assisting and i'll recommend this site to anyone with vehicle issues and is a "do it yourself".