Replaced Fuel Pump -- Still Having Starting Issue

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Sep 26, 2018 | 07:29 PM

zgaucher

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Newbie

Joined: Aug 2018

Posts: 3

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Model: Cherokee (XJ)

Replaced Fuel Pump -- Still Having Starting Issue

Hi -- I recently replaced fuel pump with a new Bosch OEM unit. To start the car, I still have to cycle the key. I'm wondering if I replaced the fuel pump with a faulty one or if there might be some other issue causing it. Is it possible that I installed a part with a bad check valve or is it possible that something else might be causing the issue? Maybe the fuel relay?

Sep 26, 2018 | 07:51 PM

Turbo X_J

CF Veteran

Joined: Sep 2009

Posts: 8,567

Likes: 20

From: ☼ Blackhole Sun

Year: My Jeep is a GMC

What's the fuel pressure in psi?

Sep 27, 2018 | 10:37 AM

PatHenry

CF Veteran

Joined: Nov 2017

Posts: 3,700

Likes: 238

From: Groton, MA

Year: 1995

Model: Cherokee(XJ)

Engine: I6 4.0L

Also what is the year?

Possibly a bad pressure regulator at the fuel rail?

Sep 28, 2018 | 11:04 PM

zgaucher

Thread Starter

Newbie

Joined: Aug 2018

Posts: 3

Likes: 0

Model: Cherokee (XJ)

Quote:

Originally Posted by PatHenry

Also what is the year?

Possibly a bad pressure regulator at the fuel rail?

It is a 1997. I will try to test the pressure this weekend.

Sep 29, 2018 | 05:20 PM

TylerA23

Member

Joined: May 2018

Posts: 114

Likes: 9

From: Greenville, SC

Year: 1998

Model: Cherokee (XJ)

Engine: 4.0

Keep us updated if you solve the issue. Sounds similar to mine.

cold start: NEVER cranks first crank, ALWAYS cranks on second crank.... or I turn the key for power for a second, then turn it all the way, and she cranks right up.

Warm crank: pretty sure it always cranks first time