FUEL SYSTEM INFORMATION
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CJ/SCJ Fuel Pumps
Here is a simple way to tell the difference. The CJ Fuel Pump (left) has 3 Fittings
- an inlet, outlet, and
a
return to the fuel tank. The SCJ Fuel Pump (right) only has 2
fittings - an inlet and an outlet.
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(photos above courtesy of Allen Cross)
The 429 CJ Fuel Pump
This original 429 CJ fuel pump has Carter part number
4907 stamped on it's flange.
What about the "X"??
The CJ pumps we have seen dated for the 1971 model year do not have
an "X" cast in to the housing, however, we do have the photo below of a CJ
pump with an "X", but since the date code is not visible, we can't
substantiate it is from the 71 model year. At this time (based on the date
coded photos above), we can say that some 71 429 CJ Mustang pumps came
without the X on the housing. Since we have not yet found a 71
model year dated CJ pump with the X, it cannot say for sure whether
the 71 429 CJ Mustang came with one or not. If you think you may have one,
please contact the webmaster with pix showing the X and date code.
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The 429 SCJ Fuel Pump
The original 429 SCJ fuel pump
has Carter part number 4842 stamped on it's flange. Based on the pumps
we have seen, we believe
the original 1971 429 SCJ Mustang versions will have a cast in "X" as shown in the photo
at left.
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Fuel Lines - Engine Compartment
The photo at left shows the two CJ fuel lines (inlet
and fuel return) where they enter the engine compartment through
the driver's side below the washer bottle. Both lines pass
through a single grommet with two holes in it. The photo at center and right shows the SCJ fuel
line arrangement which only has a single inlet line. Below left is the
CJ pump installed showing the inlet, outlet, and a return to the fuel
tank. Below right is the SCJ pump installed showing the inlet and outlet
lines.
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Fuel Lines - Fuel Tank
The photo at top left shows the CJ fuel tank sender
with a 3/8" outlet line and 3/16" fuel return line. The photo at
right shows a SCJ sender with only the 3/8" outlet line.
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Fuel Sender
The 429 SCJ Fuel Sender is shown at left. It was
used on the 429 SCJ, 6
cylinder, 302, and 351. Note this sender used one nipple as shown above. The
429 CJ Fuel Sender (at right) had two nipples on it (the smaller being the
fuel return line).
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Fuel Pump to Carb Line
The photo above left shows an installed view of the fuel pump to carb
fuel line on an SCJ. The CJ version at right is similar, but attaches to a
point at front center on the Quadrajet Carb instead of on the Driver's
side of the SCJ Holley carb, so the bends are different near the intake.
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Fuel Line Bracket
The picture at left shows an installed view of a fuel
line bracket/clip. The Ford MPC indicates71 429 CJ/SCJ Mustang and Cougar came with these
clips which bolted under the coil bracket (however, we have never found
one of these clips installed on an original car to date). This same clip design was
shared with the Boss 429. The picture at right is a detailed close up of
the clip.
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Charcoal Canister
This is the charcoal canister. It was mounted in the
engine compartment (rear of passenger side as shown above) to the inner fender
apron with a bracket. The inlet side (small fitting) hooked up to a tube
from the fuel tank. The outlet side (larger tube) ran to a fitting on the
air cleaner (with a filter element). When the engine was running, it
served as a system to aspirate and burn excess gasoline fumes to prevent
the fumes from escaping to the atmosphere. Additional photos of the
canister and it's attachment bracket are shown below.
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Gas Caps
The D1Z pop open gas cap above was used on all 1971
Mach 1s. It incorporated a built in seal as shown by the red
arrow at center. We believe the similar D2Z Pop Open cap, rear view shown
below left (identical to D1Z, but no seal), was released to be used in
conjunction with the screw on cap below right to help prevent fuel
spillage during rear end collisions - this all in reaction to the Pinto
gas tank issue.
The running horse cap (right) was used on the other
(non-Mach 1) models of '71 Mustangs.
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Fuel Tank
An original 71 Mustang fuel tank is shown above. Note
the insulation and the markings on it. Additional photos are of another
original tank. For whatever reason, it appears that not all tanks came
with insulation. The gas tank strap bolts and nuts and fuel filler neck
also below. The bolts are a dark
flat gray color, and the nuts are a lighter flat gray color. The nuts also
have a splash of flat red dye thrown on them.
Reproduction Tank Available for 71 - 73 Mustang
USS Steel Stamping on Gas Tank
If you look closely at your 30+ year old original 71 gas tank, you
*might* have the big black square United States Steel (USS) date/logo
stamp underneath. US Steel made the rolls of sheet steel that
the Big 3 tanks were stamped out from. They stamped their USS logo on
these sheets, so maybe like every 8th or every 46th tank showed the
logo...we don't know how many. Some stampings could have been at the top
of the tank and some could have been at the bottom. Some people with GM,
Dodge and Ford vehicles detail
their cars adding/showing this logo in plain sight at the bottom. It's been shown in several Mustang magazines - that's how we
found out about it. Some photos showing this marking are shown below. We
are working on determining if this same stamp was used on some 71's, but
if you choose to add it, it's your choice at
this time. If
you want to add this logo, there is a stencil kit (shown below right) available
at this link:
Inline
Tubes.
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