Author Topic: fuel pump diaphragm  (Read 413 times)

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Offline gjkatsman
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fuel pump diaphragm
« on: August 25, 2019, 09:35:24 AM »
Looking for fuel pump diaphragm (original or after market repair set)

for 1987 cbr 750f hurricane

Due to standing still over a very long period with old fuel the original parts are hardened and no longer functional.

Who can tell me where to get these items?

Offline xpd153

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Re: fuel pump diaphragm
« Reply #1 on: August 25, 2019, 12:52:41 PM »
Original CBR750F does not have a fuel pump. However, CBR1000F(SC21,SC24 adn SC31) has a fuel pump.

According to my understandings, CBR750F fuel supply system is as follows.

                                                                                                                             -----Carb #1
Fuel tank -> fuel strainer -> fuel cock -> fuel tap ---->  T branch #1    ---- Carb #2
                                                                                          ----->  T branch #2    -----Carb #3
                                                                                                                              -----Carb  #4

Several people reported their fuel tap has problems. There is another thread about fuel tap in this forum.

Offline gjkatsman
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Re: fuel pump diaphragm
« Reply #2 on: August 25, 2019, 13:24:00 PM »
Hello,

Thank you for the quick answer. Your explanation is correct, however on my bike is an additional "feature" mounted under the frame (looks as t branch) on the place where the fuel tank is mounted on the frame.

This feature is a vacuum driven pump that brings fuel to the carburators. Operated by carburator 4 via a vacuum hose.

The diaphrams in this feature are hardened and does not function any more. result.....no fuel to carburators...no running engine

Offline xpd153

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Re: fuel pump diaphragm
« Reply #3 on: August 25, 2019, 13:45:30 PM »
I think your fuel pump is my fuel tap.

please read http://hurricane.isalive.nl/forum/index.php?topic=2370.msg39294#msg39294

Offline gjkatsman
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Re: fuel pump diaphragm
« Reply #4 on: August 25, 2019, 14:13:32 PM »
yep....correct...what's in a name....anyhow my problem is a common problem and after reading all the comments i'm afraid i hve to bypass the whole fuel system.

Offline xpd153

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Re: fuel pump diaphragm
« Reply #5 on: August 25, 2019, 15:48:22 PM »
There are several petrol tap repair kits in ebay.

Please search 'petrol tap repair kit Honda' at ebay.
Of course, there is no kits for CBR750 because CBR750 is JDM.

But all petrol tap has same function. The key point is membrane sheet size.
First of all, you have to decompose your petrol tap and find out which part is broken. Then check compatibility.
As usual, vehicle vendor never tell you parts compatibility.

Offline gjkatsman
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Re: fuel pump diaphragm
« Reply #6 on: August 25, 2019, 19:09:34 PM »
IT'S ALIVE AGAIN!!  smile1004yesh

After many years it runs!!!

After cleaning all the hoses and carburators etc etc and listening to the comments on this forum i bypassed the hole fuel tap. Put in a half liter fresh petrol to floud the carburators and off she goes.....

In the meanwhile i visited ebay to look for the so needed parts.....that is another story...try to find the exact measurements
« Last Edit: August 25, 2019, 19:11:11 PM by gjkatsman »

Offline robvangulik

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Re: fuel pump diaphragm
« Reply #7 on: August 25, 2019, 20:29:52 PM »
That is always very satisfying when there are signs of life again.

Offline Golem

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Re: fuel pump diaphragm
« Reply #8 on: October 16, 2019, 10:45:30 AM »
Well done!
Careful you don't flood without a tap.

Wow a Hurricane back on the road... I haven't seen one since I saw mine leave for scraps on the back of a trailer... that's 15 years ago now I think.
Veho ergo sum