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Discussion Starter · #1 · (Edited)
I'v been using Quantum fuel pump kits lately to re build customers pumps great they come as a kit so I no longer had to source the filters and seals separately win win or at least until I got a phone call from a team that nearly had a pit fire. Irate guy says he pulled fuel line to remove tank and petrol came running out the tank outlet over the scolding hot bike :oops: I briefly flaunted the idea I had assembled it wrong or badly and asked if there had been a drop in performance since he had it fitted " Fuck No" came the reply, so I guessed poor seals or bad assembly wasn't the issue. I had the assembly exchanged for another unit. I stripped it down found no fault reassembled no fault, on a bike pulled line and fuel ran out continuously :oops:. I striped down again re-fitted with a OE pump same housing and seals repeated test, no fuel running out :unsure: So I bench tested the Quantum pump itself with a simple low pressure gravity feed, to my horror the motor allowed fuel to run out just under the weight of fuel in the tank. FFS that means not only when you disconnect the fuel line but should you have an accident and any part of the fuel system gets damaged your going to have fuel running out:oops:. I tested all manner of after market pumps including chinese ones that are 1/5 the price, I tried all the OE ones and all have a check valve preventing this, these bikes and most modern bikes do not have fuel taps anymore as the submersible pumps are supposed to be also one way valves. I called in the 4 pumps I had done with Quantum and all four are the same as in allow fuel to run out. As pictured the motor kits for G3-4 & 5 are the same, and the G2 kit I had was the same. The serial numbers of the motors are clearly in the picture, I replaced with MSR pumps that I was using before and all is good. I have been refunded by Quantum but they took no responsibility and denied there is an issue. Guys do not use these pumps and spread the word somebody somewhere could get seriously hurt with these.
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not just the quantum, been using direct replacement pumps and found the same. low fuel in tank, no problem, tank heavy with fuel, will pour gas out pump. did same thing michael checking seal fitment, all good. then saw a pattern with fuel volume. makes me worry fuel pressure not right, but performance good.
 

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Discussion Starter · #5 ·
not just the quantum, been using direct replacement pumps and found the same. low fuel in tank, no problem, tank heavy with fuel, will pour gas out pump. did same thing michael checking seal fitment, all good. then saw a pattern with fuel volume. makes me worry fuel pressure not right, but performance good.
These various pumps i tested, have all prevented back flow under light pressure, but the only pump i have tested under full load is the MSR, it is all i have used in the past and will continue with now, i just cant sleep with the notion fuel is free to piss out everywhere! Pisses me off that these Quantum pumps are advertised everywhere as direct OE replacement or better and have one way valves fitted. Seriously somebody could die with shit like this.
 

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These various pumps i tested, have all prevented back flow under light pressure, but the only pump i have tested under full load is the MSR, it is all i have used in the past and will continue with now, i just cant sleep with the notion fuel is free to piss out everywhere! Pisses me off that these Quantum pumps are advertised everywhere as direct OE replacement or better and have one way valves fitted. Seriously somebody could die with shit like this.

Do you have a vendor link you might share (BMW K1200 here)

Thanks,
Michael Aus
 
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