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  #11  
Old 06-29-2011, 03:22 PM
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Originally Posted by cbmontgo View Post
I am reviving an old thread here...

I have a '76 FJ40 with a 100% stock setup. I rebuilt the carb last winter and put a brand new OEM fuel pump in last summer.
If it is really 100% stock, how long was the under hood cooling fan running when you stopped?

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Originally Posted by cbmontgo View Post
She runs great, but I was up in Pike National Forest last week and stopped with the kids for about 15 minutes and she vapor locked for about 30 minutes before cooling enough to restart.

I am thinking that the electric fuel pump may be a good idea from what others have told me. Any particular make/model/flow rate/head pressure that you'd recommend?
Make sure you regulate down to about 7 PSI! My daughter's 60 had an electric that made the float bowl needle stick closed intermittently because it put out enough pressure for FI! If your setup is totally stock that shouldn't be as much of an issue because it recirculates, but still...

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Originally Posted by cbmontgo View Post
Also, does higher octane fuel REALLY help?
I doubt it. I just wish they'd stop putting so much darn EtOH into our gas! That is a contributor!
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  #12  
Old 06-29-2011, 03:31 PM
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Thanks.

Mine is the year prior to the carb fan unfortunately (it is a May 1976 build). I have considered installing one.
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  #13  
Old 06-29-2011, 04:53 PM
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I'm still fighting vapor lock on my '78 while driving down (say, I-25). I have an (apparently) weak Carter elec fuel pump and an OEM pump in series. I may rip it all out and use only an electric pump. Converting to an FJ60 pump is another option I hadn't considered.

I a working OEM electric carb fan that runs for 25 min. after you shut off the engine, but mine is so bad it no longer just vapor locks after parking. I may try a higher-output Carter pump (supposedly puts out 8 psi, rather than 6).

My 1980 FJ40 seems to never vapor lock, but it has headers, and I suspect they remove a lot of the heat that would be boiling the carb.
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Old 06-29-2011, 05:15 PM
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My 1980 FJ40 seems to never vapor lock, but it has headers, and I suspect they remove a lot of the heat that would be boiling the carb.
Steve, my 78 does NOT have the fan (removed) and does have the tuned headers. I am at 9800 feet in Crested Butte and go up from here. I have never had a vapor lock. I do think the headers make a huge difference in keeping the heat away from the carb. Again, I am running a 60 series pump on a stock carb. I do usually use premium fuel since I run the timing at 13 degrees, however I don't know if that makes a difference or not with vapor locking. Terry
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Old 06-30-2011, 09:03 AM
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Terry - thanks for the info. I drove my 1980 FJ today (it's going to be very hot) to see if it would choke. It sounds like a 60 series pump may make sense to try. I have tried several OEM pumps and rebuilt my own, and none have worked well. I cannot entirely explain that...
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Old 06-30-2011, 09:13 AM
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Hm, my '77 FJ40 with no carb cooling fan, stock intake/exhaust, stock fuel pump, stock fuel lines, stock carb (well, it's a '78 carb, but jetted stock for '78), running 85 octane always. Never vapor locked.

Sorry, can't really help with reasons why or why not. I think I have my timing set around 10-12 degrees BTDC, but it's been a while so I don't remember exactly.
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  #17  
Old 06-30-2011, 09:40 AM
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Originally Posted by cbmontgo View Post
Thanks.

Mine is the year prior to the carb fan unfortunately (it is a May 1976 build). I have considered installing one.
My 4/76 FJ40 had the fan...

It was mounted out in the corner by the headlight instead of on the fenderwell next to the brake master like on later units.
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  #18  
Old 06-30-2011, 09:43 AM
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Originally Posted by Rzeppa View Post
My 4/76 FJ40 had the fan...

It was mounted out in the corner by the headlight instead of on the fenderwell next to the brake master like on later units.
Interesting. Got any pics of it?
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  #19  
Old 06-30-2011, 09:48 AM
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I think one of the biggest heat-producers is the EGR reactor. Obviously most headers don't provide for EGR so that is removed or disconnected in most header applications.

Besides the fan and a strong fuel pump, one of the most effective vapor-lock preventives is the fuel recirculation system, at least while the engine is running. When first introduced the recirculation was at the bowl, after that it was at the pump itself. The former might be more effective at keeping the fuel cooler, because it keep the flow going in the pipes that run over the top/front of the block and valve cover. In any case, what it does is keep drawing cool fuel from the tank, deliver what is needed to the carb and whatever isn't needed is cycled back into the tank.
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  #20  
Old 06-30-2011, 10:03 AM
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Jeff, is your '76 a CA emissions-spec FJ40? I don't believe carb cooling fans became standard on Federal emissions-spec FJ40s until '79 or so.
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