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#Post#: 103158--------------------------------------------------
Another Fuel delivery Issue
By: mojave Rat Fink Date: May 23, 2020, 12:20 pm
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While at full throttle , I'm running out of gas, but will feed
enough fuel to limp home at 20 mph. Then be able to go full
throttle again, sometimes., process repeated. My vehicle is a
64 109 with a 1980 2.5 lire engine. using the standard rear tank
and a military aux. tank under the passenger seat with an
original fuel valve. Checked fuel pump by the hand lever and is
getting suction at the inlet port. Decided to instal new pump,
still the same amount of suction. Not super strong, but the same
as the other. Using the pumps now available from all the
sources. Verified both inlet tube's are clear in the tanks,
fittings were all removed, verified and re-installed.All pipes
were blown out with air with no obstruction. No damage to any of
the fuel pipes. When I'm starving for fuel, the sediment bowl is
full. Verified fuel to the float bowl is clear and float is
adjusted correctly. Did the best I could to verify the floats
are not hanging up. Makes no difference which tank i'm running
from. This set-up has been in place for some 15 years. now
throwing me a curve. I'm missing something here, just hoping
someone might think of something new or different. Seriously
considering installing an electric fuel pump to at least
eliminate a veriable of the mechanical pump. Thanks to all in
advance
#Post#: 103159--------------------------------------------------
Re: Another Fuel delivery Issue
By: DaveSIIA Date: May 25, 2020, 5:31 am
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I had a similar problem years ago. Turned out to be a small air
leak on the fuel tank changeover valve. Could this apply to
yours? Stripped, greased seals and rebuilt; problem solved.
#Post#: 103160--------------------------------------------------
Re: Another Fuel delivery Issue
By: Sunny Jim Date: May 25, 2020, 4:19 pm
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When I installed my 2.5 petrol I used the standard mechanical
fuel pump as the specified output is the same as for the
electric pump so I didn't have to modify any wiring. Just
fitting an electric pump will not therefore cure the problem.
What carburettor do you have (mine has an SU fitted)?
Other possibilities are:
Blocked carburettor jets - this was more of a problem with
Zenith carburettors though.
Collapsing fuel pipe causing blockage
An air leak anywhere on the suction side - you would probably
get bad starting if the vehicle is left as the fuel would leak
back.
A failing condenser - this can cause a lack of power but you
would get blackened points as well.
Fuel vapourisation - the problem would go away after cooling
down.
Lack of air bleed into tank. If you stop and remove the filler
cap, there would be a distinct sucking in of air.
On SU carburettors I once had one where the piston would
sometimes stick after running with your foot off the
accelerator. Redoing the alignments sorted this.
Sunny Jim
#Post#: 103165--------------------------------------------------
Re: Another Fuel delivery Issue
By: mojave Rat Fink Date: June 10, 2020, 1:39 pm
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so thanks for the 2 reply.'s..... >Htlr< I did check the
suggested solutions, with no luck. My carb is the original 2
throat Weber for the 2.5. It was rebuilt not long ago, but did
take it back apart during my trouble shooting. I choose the path
of least resistance and installed a 4psi electric fuel pump.
Mounted it near the secondary military tank under the passenger
seat, near the original transfer valve.Was able to use the
proper hard plastic fuel line by heating the hose in boiling
water and working it over a 1/4" NPT fitting for the pump. 300 +
miles and large fuel filter near the carb stays full as before
it could barely be seen. I'm thinking if perhaps the fuel pump
needed to be shimmed out? Might be at the end of the stroke as
is. So while the engine is running on the new pump, I can barely
feel a little suction on the feed end of the mechanical. Not
going to worry about it, making a block off plate and shelving
the original mechanical pump. Will pick up a spare electric and
store with my other emergency road repair stuff in one of the
cubby holes, just in case. Maybe this will help someone else
down the road
#Post#: 103177--------------------------------------------------
Re: Another Fuel delivery Issue
By: mojave Rat Fink Date: August 28, 2020, 6:20 am
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So 1000+ miles with the new electric fuel pump, all is working
great! Actually much better than the stock manual, as sometimes
it will sit for a week, and fuel will drain out of the float
bowl requiring to spin the motor much more than necessary to
pump fuel back in. I know I could have used the hand lever, but
much easier to let the pump run for a few. The fuel filter now
stays full instead of wondering if there was ever anything in
it. Truck is back to being 100% :giddy:
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