What tool to use to remove Fuel pump nut

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
fusselman
Posts: 3
Joined: Sat Aug 08, 2009 3:58 pm
Year and Model: S80 2.9 1999
Location: Central CA

What tool to use to remove Fuel pump nut

Postby fusselman » Fri Jul 16, 2010 9:49 pm

I'm trying to replace my fuel pump on 1999 S80 2.9. \

A special volvo tool is called for (999-5720) in vadis. I ignored that guidance and am stuck, unable to remove nuts securing pump and covering left side port.

Any one have suggestion?
Last edited by fusselman on Sat Jul 17, 2010 12:27 am, edited 1 time in total.

2bad
Posts: 10
Joined: Thu Dec 03, 2009 3:54 pm
Year and Model: S70 1998
Location: Kansas City

Re: What tool to use to remove Fuel pump nut

Postby 2bad » Fri Jul 16, 2010 11:10 pm

I assume you mean the tank pump. I changed one on a '85 740 once. It was quite a challenge. I think the operation may be similar on your car. If so, I am glad to offer this idea and hope it helps you. If, like me, you are doing your own work to save repair costs on a car that has depreciated down to very little, the expense of a one-trick Volvo tool defeats the purpose. Although, it would have been really nice to have one when I did this.

On the 740 there is a small rectangular panel in the trunk that provides access to the tank pump assembly. The access hole underneath the panel is barely any larger than the nut and only an inch or so above the closest point of the nut. You can touch the nut easily but it is impossible to position your hand(s) so that you can get any leverage on the it. The hole would need to be much larger to allow that. The nut may have been installed by hand at the factory but over the years it ends up very tight (shrinkage, etc).

All I could think of to do was to use a hammer and a cheap blade screwdriver with a long shank and very carefully pound the end of the screwdriver as you would a chisel. What you are trying to do, though, is to get the nut to move, rather than to actually chisel into the nut. There are stubby flanges all around the circumference of the nut. I placed the tip of the blade screwdriver in the corner where the very short flanges meet the rest of the body of the nut. Then, while keeping the tip there, tried to position the screwdriver as close to a tangent to the circle of the nut as possible. Then I started tapping away, gradually increasing the force of my hammer-strikes as my frustration grew. As it turned out, the nut was able to sustain a pretty good whack without cracking. Ideally you would want to work your way around the circle, tapping on each successive flange in case the build-up between the threads of the nut and what it is threaded onto has become harder at some position around the circle than at any other position. But the position of the nut in relation to the access hole only allows you to position the screwdriver nearest to a tangent to the circle (as I recall) at one point towards the front of the car and one towards the rear, or, perhaps it is better to say at the highest point on the nut and the lowest. I should probably mention that I was actually sitting in the trunk with an emergency light in order to do this. It was maddening but eventually I was able to dislodge the nut this way so that I could unscrew it the rest of the way by hand. What slowed me down the most were two things: 1) All the time insisting to myself that there had to be a better way and trying to figure out what it was, and 2) not striking hard enough with the hammer out of fear of damaging the nut.

Good luck, you can do it!

pkc303
Posts: 555
Joined: Thu Apr 30, 2009 11:32 pm
Year and Model: 850R 1997
Location: Houston, Texas
Flag: United States of America

Re: What tool to use to remove Fuel pump nut

Postby pkc303 » Fri Jul 16, 2010 11:20 pm

Use a oil filter wrench. Not the flexible kind, but the kind with teeth. It is sold at Auto Zone, etc...
Attachments
oil filter wrench.jpg
try one of these
oil filter wrench.jpg (12.5 KiB) Viewed 2092 times
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fusselman
Posts: 3
Joined: Sat Aug 08, 2009 3:58 pm
Year and Model: S80 2.9 1999
Location: Central CA

Re: What tool to use to remove Fuel pump nut

Postby fusselman » Sat Jul 17, 2010 3:25 am

Thanks for the suggestions. I'm going to try either pkc's suggestion or a generic in tank pump removal tool like the following...
Image

I'll try to do a write up on the this as Vadis was somewhat vague in my newbie opinion...

fusselman
Posts: 3
Joined: Sat Aug 08, 2009 3:58 pm
Year and Model: S80 2.9 1999
Location: Central CA

Re: What tool to use to remove Fuel pump nut

Postby fusselman » Mon Jul 19, 2010 1:57 am

The generic tool above worked quite well. Was $18. I had to modify it with a grinder to fit the volvo spacing, removing the extra length and reducing the width of the teeth.

Newbie hints not covered in VADIS

1.) Fuel lines release by squeezing small button allowing them to splip off nipples.

2.) Its obvious in retrospect, but you need to clean the area around the ports well with a shop vac and rags; and when placing the new pump remove the covers over the new nipples... I did not and ended up pulling the unit out and fishing the cover. Would have been worse if it had fallen into the tank proper.

3.) Once you've put it back together. You can prime the system by moving key to the third position between 5 and 10 times.Should start right up.

Ramp7
Posts: 6
Joined: Sun Jul 04, 2010 1:52 pm
Year and Model: 1999S80T6
Location: CT

Re: What tool to use to remove Fuel pump nut

Postby Ramp7 » Wed Jul 21, 2010 2:03 am

Where did you get your version of VADIS?

Thanks

Mark


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