My fuel pump looses its prime after sitting a few hours. I have no pressure at the fuel rail. Will I have to replace the pump or is there a valve that can be replaced instead? I know I will have to drop the tank to fix the pump and I am dreading it. This is on my 97 tj. Is an after market pump ok?
When I turn key on I hear the pump humm, turn key off and turn key back on again hear the pump humm. If I do this 2 more times yes it will start quicker. Has been like this since I had it. If I just try and crank it you wind on it for then let off and then you wind on it some more and it will finally crank up.
You can replace the combined fuel filter/regulator on top of the tank, held in place with a metal clip. The regulator is supposed to hold pressure when the engine is not running. I replaced mine several years ago because of a long crank problem.
how difficult is the regulator replacement (the one shown on the ebay link)? I also have the long crank problem and I wonder if I should replace the fuel pump & the regulator. Thanks
97 Wrangler Sport 4.0L.
3" BDS Lift, 4.11 gears, Tera Disco's, Rusty's Air tube, Rusty's adj. track bars, Class III Hitch, "Generic" Hi-Lift, 33 MT's on 8" black wheels, CB, etc. etc. etc
The fuel pressure regulator is the usual cause of slow starts after the TJ has been sitting for a while. It has a check valve inside that is there to prevent the fuel from draining back down out of the fuel rail that the fuel injectors are seated into. When the check valve fails or starts leaking, it allows the fuel to drain down from the fuel rail and back into the tank instead of staying up top like it is supposed to for a fast engine start.