hard to start when she sits for a day - JeepForum.com
 
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post #1 of 5 Old 01-04-2008, 11:06 PM Thread Starter
hepcat75
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hard to start when she sits for a day

88 jeep YJ
weber carb was the only thing done to it for performance.

Anyway I bought this from my dad and it idleled like crap and found out about that nutter bypass and did it and it idles and revs great and even starts without giving it any gas untill it sits for awhile.

My main problem is when it sits for a day it takes a while to start like there is no fuel in the carb like it drains out or something. I can spray carb cleaner and she will fire right up then die when the starting fluid runs out.

I know there is no fuel pressure regulator on it and don't know if this could cause my problem but need ideas because i want to start driving it since I have had it for a little over a year( havn't put it in my name yet ) and it is time to put some miles on her.

Any thoughts

Raymond

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post #2 of 5 Old 01-05-2008, 08:07 AM
Richmond88yj
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With the mechanical fuel pump, there's no need for a fuel regulator, it's only pumping 3-5 psi anyway.

A few things to check, Evap connections and your fuel filter. Obviously the fuel is not sitting in the carb after long periods, meaning it's draining back or evaping.

1st the fuel filter and return line. The fuel filter must be the 1 line in, two out kind. pump.. -filter= carb and return line. The two out, must be on the carb side, not the pump side. Also, the carb line must be the lower one, return line on top, reason being, this bleeds off the exess pressure back to the tank. If you have em flipped, (carb feed on bottom) the fuel will slowly leak back into the tank overnight. Also the filter MUST be at least as high as the connection at the carb, if it's lower, the bowl will drain back. (Hence the ugly steel hard lines holding the fuel lines up over your calve cover)

Check the evap system, make sure all hoses are tight and connected. (underneath windhield washer resivior) if one is disconnected it'll slowly evap the fuel from the carb overnight disipating it into the air. You won't smell it because of the charcoal inthe canister.

- Ernie


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post #3 of 5 Old 10-13-2017, 05:51 AM
blacksmithBill
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Quote:
Originally Posted by Richmond88yj View Post
With the mechanical fuel pump, there's no need for a fuel regulator, it's only pumping 3-5 psi anyway.

A few things to check, Evap connections and your fuel filter. Obviously the fuel is not sitting in the carb after long periods, meaning it's draining back or evaping.

1st the fuel filter and return line. The fuel filter must be the 1 line in, two out kind. pump.. -filter= carb and return line. The two out, must be on the carb side, not the pump side. Also, the carb line must be the lower one, return line on top, reason being, this bleeds off the exess pressure back to the tank. If you have em flipped, (carb feed on bottom) the fuel will slowly leak back into the tank overnight. Also the filter MUST be at least as high as the connection at the carb, if it's lower, the bowl will drain back. (Hence the ugly steel hard lines holding the fuel lines up over your calve cover)

Check the evap system, make sure all hoses are tight and connected. (underneath windhield washer resivior) if one is disconnected it'll slowly evap the fuel from the carb overnight disipating it into the air. You won't smell it because of the charcoal inthe canister.
i just bought (from a scammer) the north American Webber for my 1990, and can't get it to fire at all, is there any hope for it? or do i need to bite the bullet and buy the kit?

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post #4 of 5 Old 10-13-2017, 12:04 PM
mike134
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Hey Blacksmithbill, welcome to the forum. Start your own thread describing your vehicle. Any history you know.

Did you drive it home?

you can't really have a 'scammer' on a 30 year old vehicle. But the previous owner may have sold it to you out of frustration. Don't worry, the YJ is a good vehicle, the forum will work you through it.

For example: If it sat for a long time, a hard start is very very common with carbureted engines.

EDIT: Sorry, I misread this. i thought you meant you bought your YJ from a scammer. I see now that you think you got scammed by the Carb seller. That's totally possible. lol
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post #5 of 5 Old 10-16-2017, 01:35 PM
uptillnow
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Quote:
Originally Posted by hepcat75 View Post
88 jeep YJ
weber carb was the only thing done to it for performance.


My main problem is when it sits for a day it takes a while to start like there is no fuel in the carb like it drains out or something. I can spray carb cleaner and she will fire right up then die when the starting fluid runs out.

I know there is no fuel pressure regulator on it

Any thoughts

Raymond
Hey Raymond,
The "Achilles' Heal" on all Weber carburetors real or Chinese copies, is the enriching holes being exposed. (see picture, I hope)


What happens, when the idle speed screw is turned in to far, is when you shut it off the throttle plate(s) do NOT come down and cover these enriching holes and therefore the fuel continues to siphon until the fuel bowl is empty. This naturally makes it hard to start until the fuel bowl fills up.


Some users can not get their 32/36 DGEV's to idle higher than500-550RPM and insist they need to turn the speed screw in to increase the idle.
I have found if you drill a 1/16" hole in the trailing edge of the "PRIMARY" throttle plate, it will allow more air past the plate increasing the idle speed and YET keeping the leading edge of the throttle plate at or below these enrichening holes. I have done this to many Webers' with huge success.


Keep us posted, there are many smart people here that are more than willing to help.
UTN
EDIT: Sorry about the Dinosaur thread revival :-)
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