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1988 740 fule tank leak
- Thread starter Eric
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not hereplease
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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?
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.
Duong Nguyen
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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.
John Robertson
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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 .
electricsheep
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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
Chris V