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Will not start

Tiny
THESANDMAN
  • MEMBER
  • 1998 JAGUAR VANDEN PLAS
  • V8
  • 2WD
  • AUTOMATIC
  • 41,000 MILES
Wife drove about 50 miles and back with no problems. Stopped at a restaurant and Jag would not start again. No pressure at rail, no turning of fuel pump in tank. Also no power to fuel pump "fuse" in boot fuse box. Engine turns, everything seems appears normal, but no fuel and no start. (I am assuming that if key is on, power should be found at the "fuel pump" fuse in fuse box, power to other fuses okay.)
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Sunday, April 25th, 2010 AT 5:45 PM

9 Replies

Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
There is an ignition positive relay that needs to be checked here is a guide to help you test it and the location of the relay with the engine wiring diagrams so you can see how the system works.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please run this test and get back to us.

Cheers
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Monday, April 26th, 2010 AT 4:34 AM
Tiny
THESANDMAN
  • MEMBER
  • 38 POSTS
I do have power to fuse #16 in the left heel board fuse box (w/ign on).

In the boot fuse box (w/ign on) it powers all fuses except fuses 7, 8, 15, 17, 19, and 21 (all other fuses have power).

In the boot fuse box (w/ign off) power is to 1, 2, 9, 10, 12, 16, 18, 20, and 22 (all other fuses have no power).

FYI, though I have a fuse in the S/C fuel pump fuse holder, I do not have a corresponding fuel pump relay 2 in boot fuse box recepticle or stop lamp relay in its relay recepticle in boot fuse box (I do have power to both relay recepticles).
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Monday, April 26th, 2010 AT 6:54 PM
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Check the inertia switch (fuel cut off) is not tripped !

Inertia Switch. Behind right kick panel.
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Tuesday, April 27th, 2010 AT 3:00 AM
Tiny
THESANDMAN
  • MEMBER
  • 38 POSTS
Found inertia switch and pushed down rubber covered plunger (on top of switch). Not sure I heard any click (like a clicking sound when I have reset other reset switches), but could feel something depressing under rubber cap. Either way, still no fuel or power to fuel pump fuses in boot fuse box.

I saw in wiring diagram that fuse #16 in left heelboard fuse box services "fuel pump relay 4" then it in turn services fuel pump fuse #7 in boot fuse box. Where is this relay found and how do I test to see if power is getting to it and test to see if it is good or not?
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Tuesday, April 27th, 2010 AT 7:21 PM
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Sorry for the dealy in replying.


https://www.2carpros.com/forum/automotive_pictures/266999_jag2_10.jpg



https://www.2carpros.com/forum/automotive_pictures/266999_jag3_3.jpg



https://www.2carpros.com/forum/automotive_pictures/266999_jag_110.jpg

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Friday, April 30th, 2010 AT 3:13 AM
Tiny
THESANDMAN
  • MEMBER
  • 38 POSTS
I have power to the fuel pump relay recepticle (with key in on position) and I interchanged with the various matching relay blocks in fuse box, but still do not have power to #7 fuel pump fuse found in boot fuse box and still no fuel to engine. FYI, I am missing two relays in boot fuse box, fuel pump relay 2 and stoplight relay. Is it possible to use a jumper to power fuel pump fuse #7's recepticle from fuel pump relay (and therein the fuel pump) or what could I be missing here?
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Saturday, May 1st, 2010 AT 4:19 PM
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
You will only get power (hot/live 12 volt) to fuse and pump at key on for 2/3 seconds then the power will be cut by the relay. You will then only have a hot/live 12v feed again at cranking or engine running. Check you have power when someone is cranking car for you. If you have power (hot/live 12v) at cranking then the pump is bad !
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Thursday, May 6th, 2010 AT 4:01 AM
Tiny
THESANDMAN
  • MEMBER
  • 38 POSTS
You were right. Tested as you instructed and found out that pump was bad. Appreciate your assistance.
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Thursday, May 6th, 2010 AT 6:08 PM
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Glad to be of assistance ... please use our forum again in the future if needed and spread the word of our forum to family and friends etc.

Happy Motoring.


https://www.2carpros.com/forum/automotive_pictures/266999_AAA2_1142.png

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Friday, May 7th, 2010 AT 3:26 AM

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