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About 4 years ago I rebuilt my HD8 carbs and the car has run great since th=
en with no adjustments required or made.
I put the car away for the winter in about November last year.
In probably mid January I decided to take the car out. It was a gorgeous da=
y and I had to go to the grocery store about a mile away. I started the car=
and it ran fine. I noted that the gas gauge read between empty and =BC . I=
started of to the store, but I noticed an obvious smell of raw gas when I =
was driving. When I got to the store lot, I parked the car, did my shopping=
, and came back out. When I turned the key, I now noticed that the gas gau=
ge moved up to dead on empty whi8ch on my car means you are really out of g=
as!. When I started the car, I got about 100 feet when the fuel pump starte=
d hammering. I got another couple of feet and the car ran out of gas. Fortu=
nately, I was just across the street from a gas station so I took my trusty=
gas can, went over and filled it, then came back and poured it in the gas=
tank. The car started up fine but began running really rough. I went anoth=
er =BD block into another store, parked the car and went inside. When I ca=
me back out about 15 minutes later there was a pool of gas, about 2-3'wide,=
under the front of the car. I started the car and it barely ran. I literal=
ly had to coax it home. It sounded like severe fuel starvation - running ba=
rely on about 3 cyclinders.
There was no more smell of raw gas nor any fuel leak as before.
When I got home, I rapped the top of the float bowls on each carb in caser =
it was a stuck float valve. and it seemed to run a lot better. I felt at th=
at time that a float valve had stuck and probably siphoned the fuel out of =
one of float bowls through the overflow tube.
Fast forward 3 months:
Last night I was getting it ready to take it on a bit of a road trip today =
it and when I took it out, it ran very poorly - again like fuel starvation=
but not as bad as before. It also popped back through the carbs frequently=
which I interpreted to be a very lean mixture
I did the following:
put another 3 or 4 gallons of gas in the tank
Took the float bowls apart and cleaned them out - there was a bit of sedime=
nt in them but nothing worthwhile. I also checked the floats which were bot=
h leak free. I also cleaned out the float bowl filters at the in line.
I checked the Gros float valves and they seemed to work properly - held ups=
ide down, they closed and opened right side up.
I disconnected the fuel line at the fuel pump and blew air back into the ta=
nk thinking that when it ran out of gas, sediment in the bottom of the tank=
may have plugged the intake. It blew fine into the tank.
I have 2 fuel pumps on the car - the regular SU and a facet pump. I pulled =
of the fuel line at the float bowl and turned on the ignition. The SU pump =
and the facet pump each filled a coke bottle pretty quickly. I did not mea=
sure pressure. The gas looked clear and pure. I do not have a fuel line fil=
ter.
I checked the plugs all seemed good and were in fact burning on the lean si=
de.
I pulled the distributor cap and it was nice and clean inside with no sign =
of carbon tracks.
I have electronic ignition so there is nothing I can check there.
I checked the timing - it was right on.
No matter what I did it didn't make an improvement.
I replaced the Gros float valves but it made no difference.
Today I pulled the carbs (which on a BJ8 is no easy task) I checked the di=
aphrams and both were in good condition.
Now I am stumped. Is it a fuel problem or something else? Can any one offer=
any suggestions?
Brian Drab
Vancouver B.C.
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<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black"> <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">About 4 years ago I rebuilt my HD8 carbs and th=
e car has run great since then with no adjustments required or made.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I put the car away for the winter in about Nove=
mber last year.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">In probably mid January I decided to take the c=
ar out. It was a gorgeous day and I had to go to the grocery store about a =
mile away. I started the car and it ran fine. I noted that the gas gauge re=
ad between empty and =BC . I started
of to the store, but I noticed an obvious smell of raw gas when I was driv=
ing. When I got to the store lot, I parked the car, did my shopping, and ca=
me back out. When I turned the key, I now noticed that the gas gauge =
moved up to dead on empty whi8ch on my
car means you are really out of gas!. When I started the car, I got about =
100 feet when the fuel pump started hammering. I got another couple of feet=
and the car ran out of gas. Fortunately, I was just across the street from=
a gas station so I took my trusty
gas can, went over and filled it, then came back and poured it in th=
e gas tank. The car started up fine but began running really rough. I went =
another =BD block into another store, parked the car and went inside.=
When I came back out about 15 minutes later
there was a pool of gas, about 2-3’wide, under the front of the car.=
I started the car and it barely ran. I literally had to coax it home. It s=
ounded like severe fuel starvation – running barely on about 3 cyclin=
ders.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">There was no more smell of raw gas nor any fuel=
leak as before.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">When I got home, I rapped the top of the float =
bowls on each carb in caser it was a stuck float valve. and it seemed to ru=
n a lot better. I felt at that time that a float valve had stuck and probab=
ly siphoned the fuel out of one of
float bowls through the overflow tube.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">Fast forward 3 months: <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">Last night I was getting it ready to take it on=
a bit of a road trip today it and when I took it out, it ran very po=
orly – again like fuel starvation but not as bad as before. It also p=
opped back through the carbs frequently which
I interpreted to be a very lean mixture <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I did the following:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">put another 3 or 4 gallons of gas in the tank<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">Took the float bowls apart and cleaned them out=
– there was a bit of sediment in them but nothing worthwhile. I also=
checked the floats which were both leak free. I also cleaned out the float=
bowl filters at the in line.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I checked the Gros float valves and they seemed=
to work properly – held upside down, they closed and opened right si=
de up.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I disconnected the fuel line at the fuel pump a=
nd blew air back into the tank thinking that when it ran out of gas, sedime=
nt in the bottom of the tank may have plugged the intake. It blew fine into=
the tank.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I have 2 fuel pumps on the car – the regu=
lar SU and a facet pump. I pulled of the fuel line at the float bowl and tu=
rned on the ignition. The SU pump and the facet pump each filled a coke bot=
tle pretty quickly. I did not measure pressure.
The gas looked clear and pure. I do not have a fuel line filter. <o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I checked the plugs all seemed good and were in=
fact burning on the lean side.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I pulled the distributor cap and it was nice an=
d clean inside with no sign of carbon tracks.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I have electronic ignition so there is no=
thing I can check there.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I checked the timing – it was right on. <=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">No matter what I did it didn’t make an im=
provement.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">I replaced the Gros float valves but it made no=
difference.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:0cm;margin-bottom:.0001pt;lin=
e-height:115%">
<span style=3D"color:black">Today I pulled the carbs (which on a BJ8 is no =
easy task) I checked the diaphrams and both were in good condition.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">Now I am stumped. Is it =
a fuel problem or something else? Can any one offer any suggestions?<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">Brian Drab<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:black">Vancouver B.C.</span><o:=
p></o:p></p>
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