Hello good ppls! a week ago my 94 jaguar xj6 have's a hard start up problem. thinking too myself, it was just something ez, i'd check fuses and relays there all ok,*I THINK* but anywho, let me just get to the point here. The car will only start up if I put starter fluid in the Air intake and the car will start up and run just fine and i be on my way. but when i cut the car off, and try to start it up 'Without The Starter Fluid' it doesn't start up :,( ...i put a new fuel pump in (REALLY HARD TO DO) and new Fuel Filter two days ago trying to fix it but no luck yet... and i put a new Fuel Pressure Regulator in but that was 2 years ago, before all of this "Weird Car Drama" happned! i been looking in my haynes book trying to get this fix. but may be im missing something...idk, but i do know i'm running out of ideas here help!

 

You should post in the "XJ40" section...better chances for a good answer.

My guess...and that's all it is....is that the part of the fuel upmp circuit that operates the fuel pump while the engine is cranking isn't working. But I've never worked on an XJ40/XJ6 so I'm talkin' outta my hat.

Cheers
DD

 

No problem; the model nomenclature is confusing





A loose wire is always a possibility but wait for some replies from those with hands-on XJ40 experience

Cheers
DD

 

Can you confirm, by having done a pressure test, you have fuel pressure a) at start up and b) while running? It sounds like the car is not getting fuel. Did you check or replace the fuel pump relay?

Scott

 

yes i replace the fuel pump relay and still didn't work. I disconnected the outport and fuel comes rushing out. but I'll go rent a fuel pressure gauge later in the morning from autozone and check the pressure it at the rail and post the psi.

 

Ok i got it, Fuel pressure at the rail is 28-32 psi.

 

The number I've seen thrown around is usually 40psi - but I am NO mechanic. Perhaps one of the techs will chime in on whether this is enough pressure to start the car.
Scott

 

All Right Thank You!!

 

Will it start without starter fluid if you cycle the key a few times before cranking, or just not at all? IE turn the key to run for 3-5 seconds, turn off key... I usually have to do this 3-4 times with my 94 xj12 to prime it enough to start when she's cold, even with new fuel pump, relay, etc. Also is that 28-32 psi the initial pressure to start the car, or was that when it was running?
Wes

 

YOUR RIGHT!! i'd just looked in to it today. and the pump is not operateing while trying to crank the engine. But it operates when i turned the key and when i get it running?

 

Sounds to me like either a bad check valve allowing fuel to flow back into the tank, or the O ring on the pressure regulator causing same problem. Had a Jeep Wrangler with the exact same problem, in my case the new pressure regulator wasnt seated quite right.

 

Update. I took some time off and now im back at it. now It's acting up BIG TIME NOW! D: ... I tryed starting it last night and it didn't start. So I put some gas in the air intake, got it to run for 2 mins POORLY RUNNING and it just stopped (It didn't use to do that!!) an now today I can't get it to run at all. Now it starts and stops every time I put gas in air intake . i hear the pump when i turn the key on and see fuel in the line! WTF IS GOIN ON? I'M SOO SUCK OF THIS S@#$!! F#@$$@* B*^%*$ AHHHHH!! OHH! GOD! NOOOOO!!! F^%&!!....Im just going to do a video of this, So yall can see whats going on here!!

 

..

 

do you know were the fuel check valve is? i really hope its the pressure regulator, im up for anythang at this point..

 

Alphadog,
I've merged your two threads since it doesn't work to have people replying to two versions of the same thread.
The result's a bit messy but the best I can do.

 

I'm Very much appreciated there that you did that for me. i didn't know how to delete the *same thread* that i mistaken made :b

 

OK looked up for a fuel check valve on Google. and its Not Available for this car anymore. i balieve i saw some ppl on here saying, the valve is right on the top/on of the pump canister. (i remembered seeing that when i was disconnecting the line from the tank!) if i want a new one i have to buy a whole new pump assembly! thats O_O $600.00 just for that! i know ppl had to install check valves of there own outside the tank to fix the Flow Back problem. but idk if it was the same model as mine or not... Can i put check valve on the car? I need to know What valve to get? what will i need to install it? all of that. I really need to get this jag fixed here. i need to get back on the road

 

i found what the problem was!. i'd took the Tank out Again -_- it was the fuel pump Canister Lid! first time i took the tank out, i didn't paid No mind to it! But anyways, the pics below is the lid. that i fixed With Heavy Duty Insulated Wire on the non return valve. it's that silver part that broke off from it. i put everything back together and it Started Right Up and Runs great!!!