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Its raining gas!

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Its raining gas!
#1
studmn69 Avatar
studmn69 Yoni P
Twin cities, MN, USA   USA
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1970 MG MGB GT
Well...kind of.

I finally got the engine in my 74 turning over with good oil pressure. I installed the plugs and gravity fed some gas (fuel pump is dunzo) and the gas that made it into the carbs all came out the bottom. I have a pair of HIF carbs which were rebuilt by the PO. Does it sound like he left out the bottom gasket? I mean there is gas EVERYWHERE. I don't think any made it into the engine, I got a very pathetic fart from the engine. I think these need to come off and get some TLC. Hurray.

Thanks!

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Re: Its raining gas!
#2
rrmgb Avatar
rrmgb Silver Member robert schau
Ft Myers, FL, USA   USA
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1973 MG MGB
1973 MG MGB
Do you have an overflow tube connected to the carbs, directed toward the charcoal canister?
Could be floats are stuck to the bottoms of the bowls or they are full of gas.
Give the bowls a rap with plastic handle of screwdriver. They may begin to float and seal. If
they are full of gas, they will need replacements.
It's possible gaskets were left off in haste but I doubt it. Examine closely. If there, maybe they do need a little tightening.
If you do need to work on the bottom end of the HIF, it is easier to remove them to a bench for work.


"It is a mistake to try to look too far ahead. The chain of destiny can only be grasped one link at a time."
Sir Winston Churchill
---------------------------------------------------------------
"It all starts in your mind's eye, then it goes to your heart
and finally to your very soul."
G.S.George PHD

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Re: Its raining gas!
#3
Chalky Avatar
Chalky David White
Coventry, Warwickshire, UK   GBR
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1979 MG MGB GT
It may have come from the carb overflows that exit below the sump (non evap loss cars). Check hloat valves aren't stuck etc

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Re: Its raining gas!
#4
studmn69 Avatar
studmn69 Yoni P
Twin cities, MN, USA   USA
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1970 MG MGB GT
I do have the overflow set up; the gas didn't even seem to consider this an option, it looks like rs leaking out of the bottoms of both

In reply to # 3253364 by rrmgb Do you have an overflow tube connected to the carbs, directed toward the charcoal canister?
Could be floats are stuck to the bottoms of the bowls or they are full of gas.
Give the bowls a rap with plastic handle of screwdriver. They may begin to float and seal. If
they are full of gas, they will need replacements.
It's possible gaskets were left off in haste but I doubt it. Examine closely. If there, maybe they do need a little tightening.
If you do need to work on the bottom end of the HIF, it is easier to remove them to a bench for work.

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Re: Its raining gas!
#5
riley1489 Avatar
riley1489 Gold Member Bruce H
Great White North, QC, Canada   CAN
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1953 Jaguar XK120
1959 Riley 1.5 "King George"
1973 MG MGB
You have no option as you have already diagnosed the problem. As suggested remove the carburetors and check the float chambers for three things,
1) the seal is properly installed in the grove of the cover
2) ensure the covers are flat, these can distort
3) set the float level per manual instructions

B


Life's most persistent and urgent question is, "What are you doing for others?"

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Re: Its raining gas!
#6
ohlord Avatar
ohlord Platinum Member Rob C
A tiny Island off the coast of Washington State, N.W., USA   USA
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1957 Land Rover Series I "EYEYIYI"
1957 Land Rover Series I "OVRLND"
1971 MG MGB
1971 MG MGB "Bedouin 2"    & more
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Re: Its raining gas!
#7
jdeatsch Avatar
jdeatsch Jim Deatsch
Leesville, SC, USA   USA
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1978 MG MGB "Orval Shiftright"
2002 Mazda MX-5 "Two Zoom"
Check to see just how much gasoline is now in the crankcase.

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Re: Its raining gas!
#8
rrmgb Avatar
rrmgb Silver Member robert schau
Ft Myers, FL, USA   USA
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1973 MG MGB
1973 MG MGB
The HIF carb has an 'O' ring that seals the lid on bottom. Not a visible gasket.
Best to remove them together. A bungee chord works great. Disconnect throttle cable, fuel supply, evap hoses and filters. 4 nuts and slide them off their studs together. The linkage can stay together.


"It is a mistake to try to look too far ahead. The chain of destiny can only be grasped one link at a time."
Sir Winston Churchill
---------------------------------------------------------------
"It all starts in your mind's eye, then it goes to your heart
and finally to your very soul."
G.S.George PHD

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Re: Its raining gas!
#9
studmn69 Avatar
studmn69 Yoni P
Twin cities, MN, USA   USA
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1970 MG MGB GT
wait...what? How do I do this and why would it have happend

In reply to # 3253565 by jdeatsch Check to see just how much gasoline is now in the crankcase.

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Re: Its raining gas!
#10
riley1489 Avatar
riley1489 Gold Member Bruce H
Great White North, QC, Canada   CAN
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1953 Jaguar XK120
1959 Riley 1.5 "King George"
1973 MG MGB
In reply to # 3253613 by studmn69 wait...what? How do I do this and why would it have happend

In reply to # 3253565 by jdeatsch Check to see just how much gasoline is now in the crankcase.

Don't sweat this, gas never got to inlet & the engine never even ran!

Do as I suggest for trouble shoot.

B


Life's most persistent and urgent question is, "What are you doing for others?"

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Re: Its raining gas!
#11
studmn69 Avatar
studmn69 Yoni P
Twin cities, MN, USA   USA
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1970 MG MGB GT
Thanks Bruce!

I called the PO and he confirmed...basically SU finest Sieve carbs. Needs a gasket. Thanks!

In reply to # 3253619 by riley1489
In reply to # 3253613 by studmn69 wait...what? How do I do this and why would it have happend

In reply to # 3253565 by jdeatsch Check to see just how much gasoline is now in the crankcase.

Don't sweat this, gas never got to inlet & the engine never even ran!

Do as I suggest for trouble shoot.

B

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Re: Its raining gas!
#12
riley1489 Avatar
riley1489 Gold Member Bruce H
Great White North, QC, Canada   CAN
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1953 Jaguar XK120
1959 Riley 1.5 "King George"
1973 MG MGB
In reply to # 3253623 by studmn69 Thanks Bruce!
I called the PO and he confirmed...basically SU finest Sieve carbs. Needs a gasket. Thanks!

Below is what you will find. The bottom of the float chamber is held in place by 4 screws, the cover has a groove in it that holds the 'square o-ring' rubber seal. Check the cover for flatness, and set the float
level while there.


B


Life's most persistent and urgent question is, "What are you doing for others?"

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Re: Its raining gas!
#13
Donthuis Avatar
Donthuis Don van Riet
Rijswijk, ZH, Netherlands   NLD
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1972 MG MGB MkIII
Always renew this bottom ring before remount. It hardens over time and if not renewed but taken out anyway, they are a swine to get back in.
HIF's are excellent carbs, but float needle problems MAY spoil your day thumbs down

Once I bought Viton-tipped float needles for my next problem moment, my own HIF's stopped being temperamental on the floats unexpectedly eye popping smiley
(these needle sets and bottom rings weigh next to nothing so travel with me in the boot all the time, safety fast on holidays is my motto..... )

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Re: Its raining gas!
#14
studmn69 Avatar
studmn69 Yoni P
Twin cities, MN, USA   USA
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1970 MG MGB GT
Thanks everyone, I'll tackle this when my parts come in. I fixed my fuel pump last night so hopefully it will be easier to test.

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Re: Its raining gas!
#15
darkprince Avatar
darkprince David Lucas
New Castle, PA, USA   USA
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1974 MG MGB "Morris"
This. My float covers were warped as hell. I replaced them, the seals and reset the floats. Fixed the problem.

In reply to # 3253476 by riley1489 You have no option as you have already diagnosed the problem. As suggested remove the carburetors and check the float chambers for three things,
1) the seal is properly installed in the grove of the cover
2) ensure the covers are flat, these can distort
3) set the float level per manual instructions

B

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