The largest and best supported Jaguar cars enthusiast site on the Internet!


Serving Enthusiasts since 1993
The Jag-lovers Web

Currently with 3,166 members





Jaguar XJ-S Fuel Pump Mount

Jaguar XJ-S

Fuel Pump Mount


The electric fuel pump in the Jaguar XJ-S sometimes gets noisy, noisy enough that the owner takes notice.  Often, this is the result of an obstruction in the pickup, and it is of the utmost importance that the owner investigate immediately and make sure that the pickup screen is unobstructed.  If the car still has the early design pickup screen, it should be replaced with the later type that is far more difficult to plug up -- or, alternatively, the pickup screen should be removed altogether and an inline filter installed in the suction line to the pump.  Failure to address an obstructed fuel pickup situation can cause the engine to run lean at high power situations, which in turn will result in burned pistons.

If you're lucky, though, the fuel pump noise is from a far more innocuous cause.  The pump is mounted in foam that it intended to isolate the vibrations of the pump from the car.  However, the pump tends to slide downward until the hose on the outlet fitting on the pump is jammed against the floor of the trunk.  The isolation is thus defeated, and the sound the pump makes is transmitted through the metal of the car.  Looking at the arrangement in Kirby Palm's '83, you can see how this happens:

Note: Palm's car has a metal fuel line fitted, but most cars just have the hose continuing on to the main filter.

The pump is cylindrical, and is prevented from sliding downward only by friction.  There is a ridge around the outside of the pump, but it is located underneath the foam and therefore prevents the pump from sliding upward.  This is a picture of Kirby Palm's pump in its mount:

The ridge is actually supposed to be up against the bottom edge of the foam; the fact that it's not indicates that sliding has been going on.

Palm's idea for a fix is to clamp something around the pump on the other end of the pump to keep it from sliding downward.  It needs to prevent the sliding while still isolating the pump vibrations from the rest of the car.  What he ended up doing was to wrap a layer of 1-1/4" x 1/4" foam sealing strip around the pump, and then clamping it securely in place with a worm-screw clamp.  The clamp can be located around the upward edge of this foam strip so that it doesn't contact the bracket.  The assembly looks like this:

By the way, if you look closely at this pump you will notice that both terminals have the same size spade.  This is a replacement pump; on the original, one spade is larger than the other to prevent mix-ups.
 
 

 

Please help support the move to the new site, and DONATE what you can.
A big Thank You to those who have donated already!

 


       
       
       
       

Go to our Homepage
Improve your Jag-lovers experience with the Mozilla FireFox Browser!

  View the latest posts from our Forums via an RSS Feed!

Jag-loversTM Ltd / JagWEBTM 1993 - 2017
All rights reserved. Jag-lovers is supported by JagWEBTM
For Terms of Use and General Rules see our Disclaimer
Use of the Jag-lovers logo or trademark name on sites other than Jag-lovers itself in a manner implying endorsement of commercial activities whatsoever is prohibited. Sections of this Web Site may publish members and visitors comments, opinion and photographs/images - Jag-lovers Ltd does not assume or have any responsibility or any liability for members comments or opinions, nor does it claim ownership or copyright of any material that belongs to the original poster including images. The word 'Jaguar' and the leaping cat device, whether used separately or in combination, are registered trademarks and are the property of Jaguar Cars, England. Some images may also be Jaguar Cars. Mirroring or downloading of this site or the publication of material or any extracts therefrom in original or altered form from these pages onto other sites (including reproduction by any other Jaguar enthusiast sites) without express permission violates Jag-lovers Ltd copyright and is prohibited
Go to our Homepage
Your Browser is: CCBot/2.0 (http://commoncrawl.org/faq/), IP Address logged as 54.196.201.241 on 18th Dec 2017 10:54:24