I just installed a new fuel filter but forgot to install the o rings on the fuel lines so it leaked a bit when I turned over the motor. I went and got new o-rings installed and then re-installed the fuel filter then tried to start the motor. Turned over but did not start. I pulled one side of the filter to see if it was pumping fuel as I turned it over but there was no fuel coming out. So it was working when I installed the filter with no o rings but as soon as I did, fuel stopped pumping. Any ideas why that would happen. Did the fuel pump relay just "happen" to go out during that small amount of time or maybe the fuel pump stopped working within that time? I pulled the filter and blew through it to make sure there wasn't any obstructions to which there wasn't. Any ideas would be greatly appreciated!

 

Check the pump relay,also maybe the inertia switch. Also check the conections on the fuel pump.

 

I was thinking inertia switch...where is it located exactly? I found what I thought it might be on the drivers side kick panel, a black box like a relay with a rubber boot on top, which doesnt look anything like the replacement switches online. Replacement switch has a red button you can pull up and push down to reset.

 

There are 3 XJ40 versions. 88/89 90 to 92 and 93/94
All have different PUMP/Relay setups.
What mystery car do you have?????????????????????????????????????????????? ??????????

 

It is a 1994. I got it workin a bit ago. I shut the trunk, locked the car, then unlocked it, and it worked....now that is weird! I drove around for an hour or so and it actually runs a bit smoother. I'm clueless

 

Check the link harness to the EVAP flange on the top of the tank. It sometime has burnt connector pins. If the pins are burnt on the inside (pump-to-flange), you won't see them until you remove the flange from the tank.

Poor electrical contact will cause the inop pump fault. The pump might be drawing too much current.

bob gauff

 

Should this red button be compressed? I cant seem to get any fuel pressure?

 

The button is located if you were setting in the drivers seat and the front of the car is dead North,,,, the button would hit your calf midway
due west

 

Hi Shank25,

Welcome to the Jaguar Forums!

I'm sorry to hear you're having trouble with no fuel pressure. You don't mention the model year of your car. Below is a procedure for tracking down fuel pump circuit problems from Bryan N at the Jag-Lovers XJ40 forum. Please let us know if your car is a different model year (it's a good idea to add that information to your signature so others don't have to ask - let me know if you need assistance editing your signature).

XJ40 - ‘93 / ‘94 Fuel Pump Circuit Test Procedure - Issue 2
[Assuming that you have dash lights with the ignition 'ON']

1) With ignition OFF
2) Remove fuel pump relay (black base, right rear corner
trunk above BFM)
3) Do you get 12 volts at pin 30 (Brown/yellow) of the fuel
pump relay base from fuse C6 in right fuse box?
4) If yes, jump pin 30 (Brown/yellow) and pin 87 (Blue/red)
in fuel pump relay base - does the pump run continuously?
5) If pump does not run, fault is in the wiring / connector
between fuel pump relay and pump
6) If pump runs, suspect fuel pump relay is defective.
7) Replace / re-fit fuel pump relay
8) Remove oxy sensor heater relay (yellow base on firewall)
9) Do you get 12 volts at pin 30 (Brown/pink) of the oxy
sensor heater relay base from fuse C4 in right fuse box?
10) If yes, jump pin 30 (Brown/pink) and pin 87
(Blue/purple) in oxy sensor heater relay base - does the
pump run continuously?
11) If pump runs, suspect oxy sensor heater relay is defective
12) Replace / refit oxy sensor heater relay
13) Remove EMS main relay (black base on firewall)
14) Do you get 12 volts at pin 30 (Brown/yellow) of the EMS
main relay base from fuse C1 in the left fuse box?
15) If yes, jump pin 30 (Brown/yellow) and pin 87
(White/brown) in EMS main relay base
16) Try this both with the ignition ON and the ignition OFF
17) Do you hear the fuel pump give its half-second priming
burst? [You can repeat this many times and you (or an
assistant listening at the open filler neck) should hear the
half-second 'whirr' of the pump every time you jump pins
30 and 87 of the EMS Main relay base]
18) If yes, suspect the EMS main relay OR the EMS ECU is
defective (the latter, very unlikely but possible)
19) Turn ignition OFF
20) Replace / re-fit EMS main relay
21) Remove Ignition 'ON' relay (on a '94 it should be in a
white base on the firewall but on a '93 it may be buried
under the dash behind the radio)
22) Do you have battery voltage at pin 30 (Brown) of the
Ignition 'ON' relay base?
23) If yes, temporarily jump pin 30 (Brown) and pin 87
(White/pink) in the Ignition 'ON' relay base
24) Do you hear the half-second priming burst from the pump
each time you jump those pins in the Ignition 'ON' relay base?
25) If yes, suspect the Ignition 'ON' relay is defective or
fuse A5 (fuse A3 on ‘94 models) in the left side fuse box -
but if either is defective, you will get NO dash lights when
you turn on the ignition.
26) If when you jump pins 30 and 87 of the Ignition ‘ON’
relay base you do get dash lights but you do not hear the
half-second priming burst from the fuel pump suspect the EMS
Main relay.


Regarding the switch you asked about, the inertia switch is in the forward outer corner of the driver's footwell (front left corner in a Left-Hand Drive car). On our '93, it's a black plastic box with a button on top that would pop up if the switch was tripped and would need to be press back down. The black plastic housing of the inertia switch is shown near the top of Photo 4 and Photo 7 in the album at the link below:

Welcome to Jag-lovers - Members Photo Viewing Page


We're a friendly group, so please visit the New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum and post an introduction so we can give you a proper welcome, and so we can learn something about you and your car.

Cheers,


Don