I have a '98 Jeep Cherokee 4wd, 4.0 ltr, 5 sp man. trans. I am gettin NO fuel pressure. The fuel pump relay works. When I jump the brown wire leaving the relay to ground it gets pressure and fires up. WHAT could be causing this?
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Have you checked the fuel pump relay. If you haven't locate the relay and jump out pins 30 and 87 (there should be a diagram on the relay or if you look at the bottom of it, the pins should be numbered, jump out the corresponding sockets in the relay housing). If the fuel pump turns on when you do that you've verified the power feed is good and the wires to the fuel pump are good. Now with a digital multimeter check that there is battery + on pin 85 or 86. If that checks out, when cranking make sure there is a good ground on the opposite pin (if pin 85 had + on it, pin 86 should have a ground). If all that checks out you can suspect the relay is faulty.
* Starter works OK.
* Fuel pump relay and the ASD relay are not energized when switch is
in the "ON" position.
* Fuel Pump works OK when I jump the relay.
* No indication of the fuel quantity gauge.
* No indication on the Voltmeter Gauge.
sounds alot the the pcm it controls the fuel pump and ign system but the anti theft would keep it from starting because the key has a transponder in it programmed for that vehicle and that would kill all ign if triggered
could be the fuel pump, fuel pump fuse, relay or wiring. Also check the crank sensor on this vehicle. They are known to go bad or come loose causing the vehicle not to start.
WOW. You want to put a 3.9 ltr V6 from a 2001 Dakota into a 1998 Dakota with a 2.5 ltr 4 cylinder? And you want to keep the manual trans? Have you considered what you will be using for a fuel and engine managment system? If you have a wrecked truck as a host vehicle then the changover may work. But it will take patience and a lot of work. I don't think the 4 cylinder trans will bolt up but I am not sure - never tried that. However that light duty trans will probably not handle the torque for very long even if it did bolt up. Your local Auto Salvage Yard will have a changeover guide and be able to tell you if that trans will fit either engine. My recommendation is to swap everthing and change that 98 to a 01, auto trans and everything.
Good Luck
Let me know how it goes?
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