1988 740 fule tank leak

  • Thread starter Thread starter Eric
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E

Eric

I have a 1988 volvo 740 turbo i just bought. When i filled up the
tank i noticed it began to leak a little. does it sound like the seal
is shot? how hard is it to pull the tank and reseal it?
 
Eric said:
I have a 1988 volvo 740 turbo i just bought. When i filled up the
tank i noticed it began to leak a little. does it sound like the seal
is shot? how hard is it to pull the tank and reseal it?
Click to expand...

The tank is plastic, so I doubt there is anything wrong with it.
However the top of the sending unit is metal (new ones are plastic now),
that's generally what leaks. There is an inspection cover in the trunk,
no need to drop the tank.

--
Mike F.
Thornhill (near Toronto), Ont.

NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
 
not hereplease@not here.com said:
Where are you located
Click to expand...

I recently did two, on a 760 and a 740, after getting some helpfull
advices from this news group. It is not too hard but then it is not
real easy either. And no, I did not drop the tank.

The steps I went through:

1. Make sure that it leaks from the tank lid and if it does then
proceeds as follow.
2. Un-bolt the auxiliary tank if it is installed, lift it up a little
and disconnect the two pipes linking the auxiliary tank to the main
tank then remove the aux tank.
3. Remove the pannel in the boot to get access to the fuel tank lid.
4. Disconnect all pipes from the tank lid. I also disconnect the
plastic filler tube which is attached to the metal frame to get it
completely out of the way.
5. Undo the plastic nut. This is harder than it sounds. I had to get a
$Aus17 plumber tool from a hardware store for this step. It is like an
oil filter tool with a rubber strip in place of the metal ring. You
feed the rubber strip through the tool to make a loop. From underneath
the car there is just enough room to loosen the plastic nut with it.
6. Remove the tank sender/fuel pump assembly.
7. Replace the rubber seal with a new one.
8. Well, you know the rest. Installation is the reverse of removal.

In hindsight it might have been simpler to remove the bracket
surrounding the tank lid (which also holds up the tank so put some
block underneath the tank first) to provide some much needed room to
work the plastic nut.
 
When my wife's tank leaked the mechanic replaced the hose with out taking
out the tank ,seemed a tight job .Apparently some fuels rot the rubber so
when the new owner fills the tank up full as we did the leak become evident
..We lost 15 litres of fuel on the drive way .
 
I would recommend jacking the car up and checking the flexible hoses that go to the tank. They might be split and leaking. I
have swapped tanks on a 760 sedan and it was not too hard after I drained the tank.
I'm in Portland as well if you need a second set of eyes to look at it. Providing it stops raining!
Chris V
 
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