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Fuel problems continued

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Gazzaspitfire Avatar
Gazzaspitfire Gary Iron
Haverhill, Steeple Bumpstead, UK   GBR
After all the problems getting my fuel pump working(1980 spitfire 1500)it’s at least running now,my problem now is fuel is leaking bad from the float bowls,on inspection I found no gaskets fitted,I did this but leaking.it was standing for 6 years before I got it in August of last year,I have got the parts to rebuild the float chambers,it’s obviously not shutting off and flooding them,I have read that the new fuel pumps kick out too much pressure,anybody had this problem or can help

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spitfire50 Avatar
spitfire50 Paul Mugford
Rochester, N.H., USA   USA
Gary,
Once you are sure the needle and seat float valve in the float chamber lid is in good nick, if the problem persists, a fuel pressure regulator is the next step. Restricting the pressure to something below 3.5 PSI (about 0.25 bar) should stop the overflow.
All the best,
Paul

Yellowhawk Valley Avatar
walla walla, WA, USA   USA
1969 Triumph Spitfire "Walla Walla"
1969 Triumph Spitfire "Portland"
1972 Triumph Spitfire MkIV "Spokane"
1975 Triumph Spitfire 1500 "Dayton"    & more
I'm with Paul. I hear often that even some of the new stock-type pumps do put out too much pressure. But having set that long, redoing the float needle/seats would be high on my list of replacement needs.
Dan

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Spity Avatar
Spity John Biek
Fresno, CA, USA   USA
Gary, check also at the bottom of each bowl for a small piece of crud under the needle. Seems like everytime I play with my fuel lines something gets knocked loose. Usually only one bowl so yours may indeed be more of a pressure problem. John

Tonyfixit Avatar
Tonyfixit Tony M
Duncan, BC, Canada   CAN
When I went through the fuel pump woes, it turned out my new pump was putting out 10psi +

Atthat point I gave up and bought a Facet electric pump, and never looked back.

Gazzaspitfire Avatar
Gazzaspitfire Gary Iron
Haverhill, Steeple Bumpstead, UK   GBR
Just replaced both valves and needles but still gushing out from the top,looks like overflow.i have ordered a new regulator so hope this will cure it.

Lizzard d id
san jose, CA, USA   USA
In reply to # 1512739 by Gazzaspitfire Just replaced both valves and needles but still gushing out from the top,looks like overflow.i have ordered a new regulator so hope this will cure it.
Did you adjust the float so that the valve is shut off getting you the gas level specified ?

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Gazzaspitfire Avatar
Gazzaspitfire Gary Iron
Haverhill, Steeple Bumpstead, UK   GBR
How can you adjust the float?

carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
You can get floats that have a metal arm that you can bend to adjust, but otherwise you have to use a packing washer between the jet and lid. You can get the washers in different thicknesses.



'S all for now
Vic

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Lizzard d id
san jose, CA, USA   USA
In reply to # 1512760 by Gazzaspitfire How can you adjust the float?
Most often there is a bendable arm , the arm connects the float to the fuel valve (needle and seat) , the arm is bent to shut off the fuel flow when the fuel level gets high enough . If the float bendable arm doesn't push closed the fuel valve then the fuel just keeps on flowing into the float bowl and the comes out the vent .
The float shut off point is real important , when the fuel in the float bowl gets up to the recommended level the float is high enough and the fuel level is good . When adjusted the fuel level inside the float bowl isn't to high or to low . The fuel level inside the float bowl has an effect on the mixture , if it set a little bit high the mixture will be a little bit more rich , on the other side if the fuel level is set a bit low in the float bowl the mixture will be a little bit lean .
If the float and or fuel valve goes bad the mixture will go real rich most times .Rarely the float / fuel valve will go bad and cause the mixture to go lean , but it can happen .

If I ever get to England can I drive your car ?

carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
Did you replace your fuel pump? There could be small bits of dirt keeping the needle from closing. This happened to me when I first installed my SUs, I removed the lids and floats and found dirt in the seat, I rinsed it out and it has been fine since.



'S all for now
Vic

clshore Carter Shore
Beverly Hills, FL, USA   USA
Where did you buy the fuel pump?

Most parts non-LBC vendors have no clue, and just because it bolts up doesn't mean it works properly.
The stock Spitfire carbs, SU and Zenith-Stromberg, both require about 2-3 psi pressure, and that's what the factory
fuel pumps supplied.

So rather than d**k around with bandaid FPR that are also problematic, just get the proper pump.

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
In reply to # 1512779 by clshore So rather than d**k around with bandaid FPR that are also problematic, just get the proper pump.

That's what I did. I kept the electric in the tool bag with clamps and wires as a backup.

Gazzaspitfire Avatar
Gazzaspitfire Gary Iron
Haverhill, Steeple Bumpstead, UK   GBR
You can yes

Gazzaspitfire Avatar
Gazzaspitfire Gary Iron
Haverhill, Steeple Bumpstead, UK   GBR
In fairness I got it from rimmer bros who specialise in triumphs,I never buy things like that from eBay or the likes

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