• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

MGB-GT dumping gas

Share this page

Sopwith_Camel

Sopwith_Camel

Jedi Knight
Country flag
Offline
well I'm Dumping gas

so I replaced the jets and the grose jets. and i did one of the temp sensors
but the carburetors over flow is still dumping gas

I mostly have the cold weather screw adjustment in the wrong place after fiddling with it.

any ideas should i do the needles? it started on the cold mornings so I thought it was the temp sensors.

steve
 
Steve, Did you adjust the floats? PJ
 
there is an adjustment for them?
these are the HIF4 type

i first started seeing fuel dripping on cold mornings so i figured it was a temp sencer thing.
but ok ill look for a float adjuster.
steve
 
not seeing it in the hanes manual page 80.
I am susspecting something to do with choke and the cold weather stuff
steve
 
On HIF-4s, the float is in the bottom of the carb, not like the earlier models with the exposed float bowl. Here's a diagram of an HIF-4 and circled float assembly. To set the floats on the HIF-4s, the carb has to be removed from the engine. I've heard of doing the floats while on the car, but there's no way I'd try it! To delicate. PJ

View attachment 35185
I didn't add that a float could have a fine crack in it and could possibly have fuel in it. I had one do this. Best thing to do if this happins is to replace it with new.
 
Last edited:
yes i just had it apart so i know where it is.
but didnt I see an adjustment screw for it.
the crack seems possible. but the problem first started on cold mornings and it wouldnt happen in the after noon.
steve
 
Look to the choke assembly seals and as Paul suggests, the integrity of the float, along with its needle and seat. The last two should be "hospital clean" to do their job.
 
ok both are over flowing
i got the engine up to temp and took off the choke and its still leaking
so thats this mornings research.

steve
 
Steve, have you checked your fuel pressure? These carbs can't stand much over 3 pounds of pressure.
 
no i havent
but i have run the car for a year now so it would be weird it it suddently went up?
one of the guys in the club did ad a fuel pressuer regualtor to his A
I guess i should do the same.

steve
 
Sopwith_Camel said:
no i havent
but i have run the car for a year now so it would be weird it it suddently went up?
one of the guys in the club did ad a fuel pressuer regualtor to his A
I guess i should do the same.

steve
Click to expand...

Not necessarily, I'd just check the pressure and if it's at or below 3 lbs, I'd just leave it as is. JMHO. PJ
 
orded it already. i have a long delay so i tend to order quick to get stuff under way.
with any luck saterday i will get the carbs off the B and the carbs back on the Jag.
steve
 
ok it looks like the issue was the O ring on the choke so the carbs are back on and it is no longer dumping gas
i did put in a pressure regulator
I unfortunate fiddled with the folcurm screw for the tempiture sensor on one carb.
so that is my first candidate for why im down on power and it sounds like a VW Bus

yep its ideling fine on a little choke its just above freezing today
but when i pull the throttle it bogs down
steve
 
Last edited:
Back
Top