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Author Topic: Fuel starvation - pump problem  (Read 980 times)

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Offline BiG DoM

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Fuel starvation - pump problem
« on: December 07, 2017, 11:56:45 am »
Ok so on a ride this past weekend my trusty Husky let me down  >:( . Started hesitating, missing and then would start but not rev-up. Checked the usual, changed the plug etc. Appeared to be a fuel problem but was getting fuel through from tank. I guessed it was the injector and there was little more I could do without major strip-down ... SOS to my son to come with the trailer  :o So pulled the injector and soaked and cleaned it with carb cleaner - checked it under pressure and powered. Reassembled and the bugger still was a no-go.  :patch: So checked the injector in place on the TB - it was not misting but the fuel pump was cycling up. Started thinking either pump filter blocked or pump on its way out and not making enough pressure ... pulled the pump out the tank and there the problem stared me in the face. Ruptured pickup hose (this is a 630 pump). It really should have had a cable tie holding it to the bracket I guess so that it does not pull at an angle to the spigot creating a pressure point. Anyway all sorted but worth noting.
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Offline M3X3Z3

Re: Fuel starvation - pump problem
« Reply #1 on: December 08, 2017, 01:23:45 pm »
Hoses, hose clamps and ties, filter, power clips, locating clips, pump itself....shheeeet there are more point of failure inside that tank than outside on the entire bike  >:(
Gotta love em tho  :thumleft:
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Offline BiG DoM

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Re: Fuel starvation - pump problem
« Reply #2 on: December 08, 2017, 01:39:47 pm »
Hoses, hose clamps and ties, filter, power clips, locating clips, pump itself....shheeeet there are more point of failure inside that tank than outside on the entire bike  >:(
Gotta love em tho  :thumleft:

True quite messy but really no different to most in tank fuel pumps I have come across.
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Online Welsh

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Re: Fuel starvation - pump problem
« Reply #3 on: December 08, 2017, 02:13:13 pm »
is that a plastic high pressure filter.?
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Offline eberhard

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Re: Fuel starvation - pump problem
« Reply #4 on: December 08, 2017, 02:42:08 pm »
Thank you for a very informative, well put and useful write-up.
eberhard
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Offline BiG DoM

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Re: Fuel starvation - pump problem
« Reply #5 on: December 08, 2017, 03:50:09 pm »
is that a plastic high pressure filter.?

Yes  :o I would ideally like to change it to a metal one as used in cars as I can see it possibly giving up the ghost somewhere along the line as well ... although not heard of them failing (and it still looks white and new not brown and brittle and swollen). The pumps can fail though - I think like many if they are run when tank is very low or even empty they take strain and are more prone to failure due to heat build up.
« Last Edit: December 08, 2017, 08:29:51 pm by BiG DoM »
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Re: Fuel starvation - pump problem
« Reply #6 on: December 08, 2017, 04:14:38 pm »
You know BMW,s so you would know that the internal piping must be submersible, mentioning it for others. 👍
Somebody said to me at the weekend, they have been off work with Covid so long, they're getting a Scouse accent.....
 

Offline BiG DoM

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Re: Fuel starvation - pump problem
« Reply #7 on: December 08, 2017, 08:32:35 pm »
Oh and the bike is going so much better than it was - guess the hose had been leaking for awhile causing loss of fuel pressure to the injector. Also starts and idles effortlessly  :thumleft:  Maybe the injector cleaning also helped? Bike is still under 20 000km  ;D
"Love is the feeling you get when you like something as much as your motorcycle" - Hunter S. Thompson

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Offline Straatkat

Re: Fuel starvation - pump problem
« Reply #8 on: February 19, 2018, 12:48:51 pm »
BD, I did some homework on submersible in fuel pipes and learnt that the normal black stuff we use is not going to withstand fuel if kept submerged in fuel, I  got this tube that is rated for inside tank duty.
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Offline BiG DoM

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Re: Fuel starvation - pump problem
« Reply #9 on: February 19, 2018, 02:58:29 pm »
I wonder why then they use the 'black stuff'? My BMW's have also always had black piping in the tank to the pump? I know you get black fuel hose and non-fuel hose ... now if it survives petrol constantly on the inside why not the outside? Just asking ... for a friend  :biggrin:  ... and myself.

What do they call that clear one?
« Last Edit: February 19, 2018, 02:59:36 pm by BiG DoM »
"Love is the feeling you get when you like something as much as your motorcycle" - Hunter S. Thompson

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Offline Tony the Boney

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Re: Fuel starvation - pump problem
« Reply #10 on: February 19, 2018, 04:25:33 pm »
Very interesting, thanks Dom!
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Offline Straatkat

Re: Fuel starvation - pump problem
« Reply #11 on: February 21, 2018, 08:25:59 pm »
Not sure what its called, got a piece from a bike shop after doing a search for fuel submersible tubing.
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Online Welsh

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Re: Fuel starvation - pump problem
« Reply #12 on: February 22, 2018, 07:52:34 am »
I wonder why then they use the 'black stuff'? My BMW's have also always had black piping in the tank to the pump? I know you get black fuel hose and non-fuel hose ... now if it survives petrol constantly on the inside why not the outside? Just asking ... for a friend  :biggrin:  ... and myself.

What do they call that clear one?

From what I understand, the fuel line is a multi-layer with reinforcing, if it is non-submersible then the outer is a different material, possibly more UV and atmospheric resistant but doesn't like immersion in fuel.  8)
Somebody said to me at the weekend, they have been off work with Covid so long, they're getting a Scouse accent.....
 

Offline BiG DoM

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Re: Fuel starvation - pump problem
« Reply #13 on: February 22, 2018, 09:14:03 am »
Makes sense - wondering know if I must pull the pump again ... Sk - where do you get that submersible clear stuff?
"Love is the feeling you get when you like something as much as your motorcycle" - Hunter S. Thompson

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Offline Straatkat

Re: Fuel starvation - pump problem
« Reply #14 on: February 25, 2018, 03:02:40 pm »
BD speak to Runner, sure he can mail you some. He must know where to get it as he has the best bikeshop that I know of.
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Offline TK

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Re: Fuel starvation - pump problem
« Reply #15 on: March 02, 2018, 05:03:44 pm »
I understand that there is fuel hose and there is fuel hose. The difference is hose for 'in tank' were fuel is in contact with the inside and outside of the hose..........and then there is 'normal' fuel hose were only the inside of the hose is in contact with fuel.
Different (mix of) compounds for different applications.