Reviving '74 XJ12
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Junior Member
Joined: Sep 2017
Posts: 2
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From: Wisconsin
Reviving '74 XJ12
This old V12 has been parked for decades so I expected to find "turpentine" in the tanks. Instead they were bone dry and the pumps would keep running. Put 3 or 4 gallons in each tank so the pumps stop--usually.
It seems that the fuel pumps stop when given a voltage boost (above 13V). I noticed that each pump has two motors on it, but not all of the motors are electrically connected and there are loose wires nearby. Owner claims it ran fine like that. Really?
I can hear gas dribbling in the tank when one of the pumps is running, but when I remove the slotted screw caps on the fuel lines at the carbs nothing comes out and it is dry. (4 Stromberg carbs.)
Do I need to prime these pumps? Did running them dry ruin them? What tells the fuel pump to stop?
It seems that the fuel pumps stop when given a voltage boost (above 13V). I noticed that each pump has two motors on it, but not all of the motors are electrically connected and there are loose wires nearby. Owner claims it ran fine like that. Really?
I can hear gas dribbling in the tank when one of the pumps is running, but when I remove the slotted screw caps on the fuel lines at the carbs nothing comes out and it is dry. (4 Stromberg carbs.)
Do I need to prime these pumps? Did running them dry ruin them? What tells the fuel pump to stop?
Veteran Member
Joined: Dec 2009
Posts: 9,548
Likes: 2,548
From: Crewe, England
Why not post this in the forum for your car, which can be found in Classics XJ6 & XJ12 Series I, II, and II. There are plenty of experts in there currently running these cars. I have to say, though, that your fuel supply system looks to be in a mess and needs some investigation and repair. It sounds like your car has the in-tank fuel pumps, but I may be wrong. You can't get spares or even new pumps now, so external ones have to be plumbed in.
Joined: Dec 2011
Posts: 120,439
Likes: 17,009
From: Durham, UK
Welcome to the forum 7D4,
I've moved your question from General Tech Help to XJ6 & XJ12 Series I, II & III forum. Members here with the same model will be able to help.
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 information 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 XJ6 & XJ12 Series I, II & III forum. Members here with the same model will be able to help.
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 information 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
Senior Member
Joined: Jun 2011
Posts: 246
Likes: 75
From: phx/flg az usa
check out Carter P72190 in tank pump. lots of after market providers carry it. I think the original part # was 2910342.
if you know the GPH and pressure you need, call Carter fuel systems, talk to an engineer, they will help you.
that's what I did.
geneo
if you know the GPH and pressure you need, call Carter fuel systems, talk to an engineer, they will help you.
that's what I did.
geneo
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