Fuel problem
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Junior Member
Joined: Nov 2015
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From: kingsville
Fuel problem
hj all
I have a 89 xj-s. I have tested the wires coming from the wire harness and all is well except the wires leading to the fuel pump no voltage. I have checked the fuses non blown. Any Ideas
I have a 89 xj-s. I have tested the wires coming from the wire harness and all is well except the wires leading to the fuel pump no voltage. I have checked the fuses non blown. Any Ideas
Veteran Member
Joined: Mar 2008
Posts: 25,520
Likes: 11,712
From: Pacific Northwest USA
Assuming a V12....
Voltage to the pump itself comes from the fuel pump relay.
The relay is triggered by the fuel injection ECU in the trunk. Specifically, the ECU grounds the relay via the orange wire. A common fault is that a problem in the ECU disables this ground circuit
So, ground the orange wire at the fuel pump relay and see if your pump circuit powers up
The relay is in the trunk, RH side, near/above the ECU....roughly speaking
Cheers
DD
Voltage to the pump itself comes from the fuel pump relay.
The relay is triggered by the fuel injection ECU in the trunk. Specifically, the ECU grounds the relay via the orange wire. A common fault is that a problem in the ECU disables this ground circuit
So, ground the orange wire at the fuel pump relay and see if your pump circuit powers up
The relay is in the trunk, RH side, near/above the ECU....roughly speaking
Cheers
DD
Joined: Dec 2011
Posts: 120,439
Likes: 17,004
From: Durham, UK
Welcome to the forum 89xjsmike,
I've moved your question from General Tech Help to XJS forum. This is the place to post tech questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
I've moved your question from General Tech Help to XJS forum. This is the place to post tech questions about your model.
Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.
Graham
Joined: Feb 2010
Posts: 28,785
Likes: 11,265
From: Adelaide Stralia
As Doug has said, and also assuming a V12.
A few things to check.
The fuel pump relay is powered up by the main relay.
The FP relay is the one in the Black socket, and next to it in the Red socket is the Main relay.
Check the wire terminals INSIDE those 2 sockets, and they have been known to "push out" as the relay is plugged in.
On the battery +ve cable, about 8" down from the terminal is a plastic cover with 2 LARGE Brown wires inside it. These are the "power" wires for those relays, and other things, and they fall off. Check them VERY carefully, coz they can be tricky to refit, due to the terminals sliding down the side of the spade instead of onto the spade, so take your time.
Inside the cabin is your Inertia switch. Our RHD cars have it on the RH "A" pillar, and is cover with a Black plastic trim. I woulod pull the button UP, and then firmly push it down to reset it. This switch will KILL the fuel pump circuit in a heartbeat.
A few things to check.
The fuel pump relay is powered up by the main relay.
The FP relay is the one in the Black socket, and next to it in the Red socket is the Main relay.
Check the wire terminals INSIDE those 2 sockets, and they have been known to "push out" as the relay is plugged in.
On the battery +ve cable, about 8" down from the terminal is a plastic cover with 2 LARGE Brown wires inside it. These are the "power" wires for those relays, and other things, and they fall off. Check them VERY carefully, coz they can be tricky to refit, due to the terminals sliding down the side of the spade instead of onto the spade, so take your time.
Inside the cabin is your Inertia switch. Our RHD cars have it on the RH "A" pillar, and is cover with a Black plastic trim. I woulod pull the button UP, and then firmly push it down to reset it. This switch will KILL the fuel pump circuit in a heartbeat.
Senior Member
Joined: Dec 2012
Posts: 355
Likes: 143
From: Shiawassee County, Michigan, USA
As Doug has said, and also assuming a V12.
A few things to check.
The fuel pump relay is powered up by the main relay.
The FP relay is the one in the Black socket, and next to it in the Red socket is the Main relay.
Check the wire terminals INSIDE those 2 sockets, and they have been known to "push out" as the relay is plugged in.
On the battery +ve cable, about 8" down from the terminal is a plastic cover with 2 LARGE Brown wires inside it. These are the "power" wires for those relays, and other things, and they fall off. Check them VERY carefully, coz they can be tricky to refit, due to the terminals sliding down the side of the spade instead of onto the spade, so take your time.
Inside the cabin is your Inertia switch. Our RHD cars have it on the RH "A" pillar, and is cover with a Black plastic trim. I woulod pull the button UP, and then firmly push it down to reset it. This switch will KILL the fuel pump circuit in a heartbeat.
A few things to check.
The fuel pump relay is powered up by the main relay.
The FP relay is the one in the Black socket, and next to it in the Red socket is the Main relay.
Check the wire terminals INSIDE those 2 sockets, and they have been known to "push out" as the relay is plugged in.
On the battery +ve cable, about 8" down from the terminal is a plastic cover with 2 LARGE Brown wires inside it. These are the "power" wires for those relays, and other things, and they fall off. Check them VERY carefully, coz they can be tricky to refit, due to the terminals sliding down the side of the spade instead of onto the spade, so take your time.
Inside the cabin is your Inertia switch. Our RHD cars have it on the RH "A" pillar, and is cover with a Black plastic trim. I woulod pull the button UP, and then firmly push it down to reset it. This switch will KILL the fuel pump circuit in a heartbeat.
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