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Replaced Fuel pump module now 1995 Jeep Grand Cherokee 4x4 will turn over but will not start. Acts like security system is engaged but have gone thru the steps to disengage and still will not start. Can you give me any ideas what might be going on? Has new computer as well.
Re: Replaced Fuel pump module now 1995 Jeep Grand...
Does it have spark while cranking the engine? Will it start while cranking and spraying starting fluid/carb cleaner into intake? If it still does not start with the spray fluid, check your crank sensor.
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dont just replace parts and hope--u must target the area--a data stream run w factory gear is really helpful--a code reader is usually not enough-----the module u took out is connected to ignition----inspect coil-plug wires--ignition module--distributer cap may be worn inside--look for any loose wiring in engine area----may need a fuel pressure test--regulator and pump cud be worn---basic spark and fuel hardware are the weakest links
Your indications sound more like a clogged fuel filter or intermittant fuel pump. But it could also be your air supply! When was the last time you changed your air filter and fuel filter. I would start with those two first and then check the fuel pump.
My 95 Jeep GC had a similar problem when I was doing a lot of driving on dirt or gravel roads, and I had to blow out the air filter (with compressed air) often to clear the problem.
Hi,
The best and quickest test you can do is to remove the main fuel hose outlet from the fuel filter.
Turn the key on and see if any fuel comes from it.
If not then chances are your fuel pump is faulty and you need to replace it.
Before you do that just check you have ignition supply at the fuel pump when ignition is turned on, in some case's you need to hold the ignition key in the start position before the fuel will run out of the hose which you have removed, so try this also.
Let me know if you need more information.
Thanks
Jason
since the computer is only supposed to send fuel and spark signals in reaction to input info, unless a wire in the harness is either grounding or crossing into an output wire, i'd think it's safe to assume the computer is doing that internally. Another reason is that if it were a wiring problem, pretty likely it would not run well after you did get it started. The only thing I'd do aside from replacing the computer is to unplug all the sensors one by one while it is acting up, to get an idea about wether the errant signal is coming from a sensor or internally. Likely you can get another computer from a scrapyard.for lots less than a new one. Since this is a "guess" repair, you may want to try that.
its either the fuel pump or relay, crank sensor or ignition module or coil. Or even possibly a failed computer, If it will start with quick start then its a failed fuel pump or relay or fuse for it. If it still does not start then testing components will be needed in the ignition system
Spray some starting fluid into the air intake for a couple seconds, then try to start. If it starts for a couple seconds and dies, you have a fuel delivery problem i.e. fuel pump or relay,
i had the same problem with my 96 jeep...apparently my ground wire for my pump had come disconnected, i used a little clamp to reattach it and havent had any problems out of it since...mite wanna try this before taking it into any shops
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