Question about Jeep Grand Cherokee

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Did an oil change, filled gas tank, put in GUMOUT, 1999 Jeep GC

Did an oil change, filled gas tank, put in GUMOUT per instructions... 1999 Jeep GC, will not start now. Sounds like it wants to. Cant smell any gas. Cant hear the fuel pump. Checked all fuses. There is a symbol on the dashboard: a key within a circle.. .or a line through it. Anyone know what that means? I'm beginning to think I dont have a fuel problem but a security system problem. Any advice, I would be very grateful. thanks.

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If you put a fuel cleaner additive in the tank I would change the fuel filter. I believe on this model it is located in the frame just ahead of the fuel tank on the drivers side. Any foreign material cut loose from inside the tank from the cleaner often clogs the filter.

Posted on Jul 15, 2009

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Do you have fuel on the spark plugs but the fuel pumps are junk in jeeps used to replace a lot of them. if you have fuel check for spark if you have fuel and spark replace the spark plugs and hold the gas to the floor untill it starts but you can always check if the fuel pump is pumping by checking the feul pressure

Posted on Jul 15, 2009


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My Answer:

Poor gas mileage can be a result of many many things.

First of all you need to find out what is the factory normal gas mileage for your model year Jeep SUV. It should have said on your window sticker if you bought it brand new. If you are a 2nd or 3rd owner then a Jeep dealer would have info. Google search will tell you as well, and only takes a couple minutes to find.

I did a quick Google search and for a 2003 Jeep Grand Cherokee with a (4.7L V8 engine) the average mileage is roughly 14 mpg.

Not sure what engine you have as to options, etc?

How you drive will greatly change that number up or down depending on a number of driving and driver variables.

A few being -

Driving habits?

Tire pressures?

Engine tuned up?

Lube & oil/filter changes (every 5,000-7,500 miles? Air filter changes (every 10,000-15,000 miles)? Read your auto manual for exact recommended intervals.

How many people in the SUV on average?

Are you towing anything?

Type gas you are burning - BRAND? (See injectors below)

Area you are driving in (hills and valleys verses flat out,

Jeeps in general don't have a good track record for great mileage, and rough engine idling is always a clue that your fuel injectors are dirty. Typical on all Jeeps with port fuel injection systems! On Jeeps with dirty fuel injectors your mileage will go way down accordingly. If your not putting at least a 12 oz bottle of say Walmart brand Super Tech Fuel Injector Cleaner (~ $1 each) in your gas tank religiously every logged 1000 miles, or every 2 tank fill ups, then you are just inviting dirty fuel injectors and POOR fuel economy!

My 1993 Ford XPLR with a 4L V-6 engine (and ~ 160,000 flawless driven miles) gets roughly 22 miles per gallon on the highway with cruise control on, and about 17 around town on average. I religiously put a 12 oz bottle of the above injector cleaner in my gas tank every 1000 miles!! Of course I do all my own tune-ups, general repairs, and suspension maintenance (shocks, O2 sensors, trans oil changes, lube & oil/filter changes, code reading and clearing, etc) myself and it shows! I don't trust repair shops except for say Tires and Balancing at SEARS.

Hope that helps ease your mind about gas mileage as it relates to your Jeep there.


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