I’ll start with a short description of my qualifications that are relevant to a discussion of motorcycle fuel tanks.
I’ve got a Bachelor of Science degree in Mechanical Engineering.
I’ve been working on cars and bikes for 50 years (yes, since I was 5).
My father has both a BSME and an MSME degree.
I’ve worked as a mechanical engineer for Billion dollar companies in motorsports and aerospace.
I’ve been fitting aftermarket parts to motorcycles for 40 years.
I am far more than “A fellow with a Ducati repair garage”.
That’s more than enough dick swinging for the matter at hand, so we won’t need to go there again.
and have one unhappy customer that his mechanic evidently talked him into a Kevlar resin tank.
I don’t know who you’re talking about, but it’s not me, I’ve not talked my unhappy customer into a Kevlar resin tank.
The mechanic showed photos of lack of blind holes in two locations. The pump flange and fuel cap well as if we perpetrated an unacceptable method or standard. All other metal manufacturered tanks on showroom floors all over the world are designed and built like that. It's the "standard" and we supply an aerospace quality fuel sealant to use on those screw threads as opposed to a composite tank where that's the method you have to use.
Unfortunately it's been put forth in a way that implies we did something underhanded.
Open (non-blind) holesThe first two sentences are true, I indeed showed photos of the lack of blind holes in two locations, and I stand by the conclusion that it’s “an unacceptable method or standard”..
The rest of your statement is categorically untrue.
I’ve never seen a motorcycle gas tank in metal or plastic with non-blind holes through to the interior in the manner you have executed.
I’ve inspected 4 different style Ducati tanks in my shop, using a borescope.
None of those have non-blind holes.
In anticipation of a reply along the lines of “Well, everyone *else* does it that way.” Here’s a photo of the petcock mounting flange on an aluminum Honda RC30 gas tank.
It clearly shows a boss on the inside so that the screw hole is blind.
All of the other holes on that tank are the same as well, possessing bosses such that the holes are blind.
The “Aerospace quality fuel sealant” was neither provided with either tank, nor mentioned until I identified the through holes as a potential leak.
I have talked to Damon Industries directly about their Red-Kote.
They categorically denied any “Aerospace” qualifications for that product.
Furthermore, the holes in your tank for the latch and the rubber pads are blind.
There must be some reason you did it that way, as it's more difficult.
Why did you only do some of the holes that way?
Rubber linesThe rubber lines in the tank will eventually fail and need to be replaced.
The Legendary tank in my shop, the one that I photographed, cannot have the hoses replaced without cutting the tank open, as you stated. Are you stating that cutting the tank open to replace the lines is a “standard” repair method?
Regarding metal lines, the above noted RC30 tank has aluminum tubing inside the tank, welded in place to provide a filler cavity drain.
Fuel Pump ClearanceWe also had a group of 3 tanks that were inadvertently fabricated with the S2R panels which interfered with fuel pump assembly. These tanks were shipped back at our expense and repaired immediately. The hose which had spec'd as immersible came in as non on a tank and customer service offered, again to have the tank returned on our dime for refitting.
That describes the first tank that I received, it did interfere massively with the fuel pump assembly.
Indeed, it was shipped back at your expense.
The 2nd tank is definitely not the 1st tank in a repaired state, the welds and surface finish marks on it do not match the photos I have of the 1st tank.
Yes, you offered to have the 2nd tank returned and refitted with proper hose.
Regarding your OffersThere are other things you offered to me, when we spoke on the phone about the issues with the first tank. You offered me the opportunity to measure the tank and fuel pump, and mark where it needed to be clearanced or modified to avoid interference with the fuel pump assembly. But I’d need to check to make sure that mod didn’t interfere with the battery, or the wiring, or or or ….You even offered the opportunity to fix it myself or have someone else fix it.
You’re now offering me the opportunity to box up the 2nd tank, and tote it to UPS, so you guys can fix it too.
All of these offers and opportunities for future work, plus the work that I had to do test fitting the tank and parts, taking pictures, talking with my customer, talking with you, writing the first summary, and writing this reply.
These offers, and opportunities, are only missing one thing.
Payment.
You manufactured the tank and sold it to my customer.
You now have that money.
Yet, you’ve never offered to pay me for the time I’ve put in to identify the problems.
Or pay me for boxing up the 1st tank and taking it to UPS.
Nor offered to pay me for the R&D effort to help you fix it.
Let alone the cost of somebody else fixing it.
I’ve easily spent 5 hours on it just today, and certainly at least that much again with all the work done before.
I’m more than happy to send you an invoice for that, say 10 hours at my shop rate of $84/hr.
Because I can't in good conscience bill my customer for errors that *you* made.
Would you like me to send that invoice via email or USPS?
LiabilityAlong with the previous offers of fixing it myself, or having someone fix it, or using a liquid sealer on the threaded holes, comes the attachment of liability. The moment I do something, it becomes my problem too.
I am not willing to go bankrupt paying lawyers to defend myself against the consequences of errors that *you* made.
Additionally, quite a few houses here have a gas-fired water heater in the attached garage.
So, there is the risk of an internal non-immersion rated hose leaking, let’s say 3 gallons of gasoline onto the floor of a closed garage with an open flame in the water heater.
Those houses have bedrooms attached to the garage, or even over it.
I have no desire to have that disaster hanging over my head.