CBR 1000F "Hurricane" 1987-1996 CBR 1000F

Fuel pump relay and a carb plumbing question

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Old 08-18-2018, 05:54 PM
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Default Fuel pump relay and a carb plumbing question

Is there a cheaper relay that interchanges for 36100-MM5-008 (fuel cutoff relay) on an '88?

We're trying gravity but it's still not starting.

Settle a disagreement for me: the black nipples coming out of the carbs (the higher pair, since the lower are for the fuel line. Are those vent to atmosphere, vacuum, or something else? I don't know what they're supposed to hook to.
 
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Old 08-20-2018, 10:09 AM
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I don't know of a cheaper relay, but those black nipples are vacuum gauge ports for carb syncing. Make sure they're in good shape or else you'll get a vacuum leak
 
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Old 08-20-2018, 12:13 PM
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Originally Posted by tentacleslap View Post
I don't know of a cheaper relay, but those black nipples are vacuum gauge ports for carb syncing. Make sure they're in good shape or else you'll get a vacuum leak
And that's why my bike isn't running. Somewhere in there I've got vacuum hoses not hooked to anything. Where should those nipples hook to?
 
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Old 08-20-2018, 12:53 PM
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The nipples should be blanked off. The only time you need them is when you're syncing the carbs

I'm not sure if I'd make the leap to vacuum leaks as being the cause of your no-start though. Unless you've got the California version, there's not much of a vacuum system on these bikes. Later models got a vacuum-fed fuel system, but the 87-88's used a fuel pump. That said, mine would idle even bypassing the fuel pump, so if it's not starting, I'd probably start with the basics and work back from there
 
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Old 08-20-2018, 02:17 PM
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Originally Posted by tentacleslap View Post
The nipples should be blanked off. The only time you need them is when you're syncing the carbs

I'm not sure if I'd make the leap to vacuum leaks as being the cause of your no-start though. Unless you've got the California version, there's not much of a vacuum system on these bikes. Later models got a vacuum-fed fuel system, but the 87-88's used a fuel pump. That said, mine would idle even bypassing the fuel pump, so if it's not starting, I'd probably start with the basics and work back from there
Yeah, turns out I was looking at the overflow vents... yeah, the bike is in the hands of my father who's skilled on classic cars, hoping he can figure it out because I can't.
 
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Old 08-21-2018, 07:32 AM
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Originally Posted by canttaketheshyfromme View Post
Is there a cheaper relay that interchanges for 36100-MM5-008 (fuel cutoff relay) on an '88?
We're trying gravity but it's still not starting.
I don't believe you need a fuel cutoff relay when going to gravity feed. When you remove the pump you have removed what the relay is controlling.
 

Last edited by TimBucTwo; 08-21-2018 at 07:35 AM.
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Old 08-21-2018, 07:50 AM
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TBT is correct. Your on/off/reserve **** becomes the cutoff relay of sorts. It will be a good practice to turn it to the off position wheile parked if going gravity fed.
 
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Old 08-22-2018, 09:35 AM
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Ugh. It was water in the fuel. 2 weekends of making myself sick with stress over this and I never checked for water in the fuel.
 
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