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Bike pump explosion..

Old 11-08-16, 02:06 PM
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Bike pump explosion..

So I was in a big hurry to get to work yesterday and I pumped up my front tire a little too fast and maybe 10 psi over on accident. I let some air out and thought it was ok.. and then I went to pump my rear tire and the nozzle strangely kept blowing off at around 90 - 100 psi when it normally allows me to go to 120. I was getting frustrated and kept putting my nozzle back on to get up to the correct psi until all of a sudden the bottom of the hose blew on my park tool pump. My bike had a nearly flat tire and I had to use my hand pump the rest of the way almost making me late to work. So I guess thats not the way your supposed to pump and I wont be doing that again since all the built up pressure from going way too fast let that happen. Anyways does anyone know how/where I can get a replacement hose for my pump? There's really no warranty since I got it off amazon over a year ago..
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Old 11-08-16, 02:08 PM
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got some video?
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Old 11-08-16, 02:10 PM
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Was it a Presta valve that you didn't "burp" first?
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Old 11-08-16, 02:19 PM
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A good reason to squeeze your tires. Do it regularly and you will know what's actually happening at the tire regardless of what your gauge says.

(Also a good reason for using real frame pumps, not mini pumps. Actually, in all truth, I do not know this, I have never owned or used a mini pump. I find 100 pumps to be plenty and hear the small pumps require more so I haven't changed. 100 gets me to full riding pressure.)

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Old 11-08-16, 02:46 PM
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Odds are the hose blew because it was ready to anyway, and had nothing to do with pumping too fast. However there is also a possibility that it was heat related, since compressing air generates heat (where the phrase "hot air" comes from).

If the hose blew apart at the base of the pump. then heat is likely a factor, if not as an immediate cause, at least as a long term one.

Either way, Park has historically made hoses available, so you should be able to source one easily enough, or can go to Park's site to find a source.
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Old 11-08-16, 03:19 PM
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I'd go with the "no burp" guess, or you had the pump on cocked such that it jammed the valve shut. You can get some really high pressures with a bike pump!
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Old 11-09-16, 07:39 PM
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Originally Posted by ThermionicScott
Was it a Presta valve that you didn't "burp" first?
Or unscrew the keeper nut?
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Old 11-09-16, 08:43 PM
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What is burping the valve? I have never heard of doing this. I know what it sounds like but why do it.
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Old 11-10-16, 06:12 AM
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Sometimes the valve seal gets stuck and even air pressure wont unstick it. That's why you lightly tap the top of the valve to make sure the valve isn't stuck.
That's "burping".
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Old 11-10-16, 06:47 AM
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Standard procedure for a Presta tube is to first tap the stem prior to inflating. I don't believe Park Tools sells new hoses with a head so a call to them might help or you may need to buy another brand hose/head for replacement if you can find one that will work with the pump fitting. Photos always help.
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Old 11-10-16, 07:58 AM
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Unless the hose has split is probably can be put back in place. The current model pump (PF8) appears to have a hose fitting that I would bet is a screw on fitting
at the base of the pump. If you unscrew this, it should fit over the end of the hose and the unit screwed back in place. My Park is an older model but all the
hose fittings at the bottom of the pump are screwed on ( unlike the swaged on hoses of some of my older defunct pumps).

Park video: Home Mechanic Floor Pump | Park Tool on how to use the pump demonstrates the burping, though I
tap the end of the valve 2-3 times, compared to the video once. I have had sticky presta valves that despite burping enough to drop tire pressure 20# or so will still
not release until the tire pump gets up to 160# or so IN THE PUMP HOSE (NOT in the tire) before the presta valve releases and then air starts going into the tire.
Normally you will hear the presta valve click with each pump as air goes into the tire.
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Old 11-10-16, 08:45 AM
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Originally Posted by Wallonthefloor
So I was in a big hurry to get to work yesterday and I pumped up my front tire a little too fast and maybe 10 psi over on accident. I let some air out and thought it was ok.. and then I went to pump my rear tire and the nozzle strangely kept blowing off at around 90 - 100 psi when it normally allows me to go to 120. I was getting frustrated and kept putting my nozzle back on to get up to the correct psi until all of a sudden the bottom of the hose blew on my park tool pump. My bike had a nearly flat tire and I had to use my hand pump the rest of the way almost making me late to work. So I guess thats not the way your supposed to pump and I wont be doing that again since all the built up pressure from going way too fast let that happen. Anyways does anyone know how/where I can get a replacement hose for my pump? There's really no warranty since I got it off amazon over a year ago..
As FBinNY says, the hose was likely to go anyway. I would suspect simple aging of the hose material along with heat from the action of pumping. If the hose split, simply cut off the split part and put it back onto the pump. If the hose just came off, slide it back on and make sure the clamp is on tight.

You might contact Park Tools and tell them about the problem. Include pictures so that they can see what happened. They've been very responsive to issues I've had with tools in the past and may even send you a new hose.
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