Hard to start on incline - JeepForum.com
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post #1 of 3 Old 10-16-2013, 11:27 PM Thread Starter
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2000 WJ 
Join Date: Feb 2013
Location: Aurora
Posts: 33
Hard to start on incline

Have a 00 WJ 4.7 recently it has been hard to start when it is parked nose first in the driveway which has a incline to it. When I park it in the street which is down hill no problems starts right up. No issues when driving no funky idling, surging runs great. Only other things that I did noticed is when trying to start when in the driveway is that it does start after about 4-5 cranks sometimes it spits and sputters then the idle does rev up to about 1500 then drops down. When you try and step on the pedal to rev it up when it starts to spit and sputter it wont rev up. I replaced the fuel pump on it last year when I bought (mice chewed on the wiring to the pump). Cleaned the throttle body, plugs (looked like they were never change worn flat). All of the maintenance required because the previous owner must not have know what that was.

I no longer have a fuel pressure tester to check to see in the pump i put in is working properly but it seems like it is no other driveability issues otherwise. I was thinking possible fuel pressure regulator?

Any input would be appreciated.

besides just don't park in the driveway

It's a jeep.... Dents add character.... Just Roll With It.
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post #2 of 3 Old 10-16-2013, 11:35 PM
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2003 WJ 
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Sounds like it's probably losing fuel pressure sitting on the incline. It's probably not the pressure regulator, but the anti-drainback valve built into the fuel pump, which is usually the first part of it to fail, especially on aftermarket pumps.

Since that valve typically fails long before the mechanical parts of the pump, the simple live with it solution is when you start the Jeep, turn the key to the on position for 2-3 seconds to allow the pump to prime the fuel pressure, then turn the key over to start. Should fire right up.

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post #3 of 3 Old 10-17-2013, 12:01 AM Thread Starter
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2000 WJ 
Join Date: Feb 2013
Location: Aurora
Posts: 33
Thanks for the input, guess I need to decide if I should live with it for now or try and warranty out the pump assembly.

It's a jeep.... Dents add character.... Just Roll With It.
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