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How to repair fuel tank leak
1990 Mazda B2600

How to repair Fuel Tank Leak

(1990 Mazda B2600)
Removed tank to replace/repair fuel pump sending unit assembly as the fuel line had rusted thru. Repaired this assembly and pressure tested it before reinstalling. Noticed that the rubber mount piece on the back flange of the tank had distorted and shrunk such that I had to elongate its holes in order to fit it over the tank mounting bolts. Filled tank full and noticed back lower half of tank was dripping gas. (Top of tank is dry)
I suspect that tank rear flange bolt holes are leaking. Can this be repaired by clamping with copper washers --- this will bypass the rubber mount feature of the original installation?
1 answer & 2 comments
Popular Answer
on June 30, 2017
Unfortunately, without - hands-on/visual inspection - we can't say .. Repair 'might' be possible .. Highly recommend fuel tank replacement!
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on June 30, 2017
Yeah, well replacement is a thought I had already considered. However, I was hoping to find someone who had already had hands on experience with this kind of leak, in as much as I can't say for sure without removing the tank again. What I do know is that the front rubber strip is not damaged or shrunk and it also has bolt holes thru it for mounting the tank and they obviously have not leaked.
My concern for repair by sandwiching the bolt holes with copper washers is that this will eliminate the damping feature of the rubber mount and may accelerate fatigue cracking due to vibration.
on June 30, 2017
You're probably not going to find an answer on an open forum for fuel leakage repair on your vehicle... Just saying.


https://repairpal.com/repair-shops
General Diagnosis
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on June 30, 2017
Unfortunately, without - hands-on/visual inspection - we can't say .. Repair 'might' be possible .. Highly recommend fuel tank replacement!
Sign in to reply
on June 30, 2017
Yeah, well replacement is a thought I had already considered. However, I was hoping to find someone who had already had hands on experience with this kind of leak, in as much as I can't say for sure without removing the tank again. What I do know is that the front rubber strip is not damaged or shrunk and it also has bolt holes thru it for mounting the tank and they obviously have not leaked.
My concern for repair by sandwiching the bolt holes with copper washers is that this will eliminate the damping feature of the rubber mount and may accelerate fatigue cracking due to vibration.
on June 30, 2017
You're probably not going to find an answer on an open forum for fuel leakage repair on your vehicle... Just saying.


https://repairpal.com/repair-shops

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