Anyone know if a mechanical fuel pump will fit on a c4?
11-04-2012, 03:21 PM
#1
Pro
Thread Starter
Anyone know if a mechanical fuel pump will fit on a c4?
Anyone know if a mechanical fuel pump will fit on a c4? my car has a carburetor and I can't find a good spot for an electric Holley pump. Just don't know if it will clear the suspension.
11-04-2012, 03:28 PM
#2
An '84MY I believe the answer is yes as far as the engine capabilities. As to physical space available, I have no idea. You should need just a push rod, a plate and a pair of gaskets.
11-04-2012, 04:36 PM
#4
11-04-2012, 04:51 PM
#5
Pro
Thread Starter
The return line isn't big enough and I didn't feel like pluming a whole new line. I put in a Holley blue pump where the fuel filter was but somehow the motor part was filled with water. I guess I could get another one and shield it from moisture.
11-04-2012, 05:59 PM
#6
11-04-2012, 08:33 PM
#9
The OP mentions in post #3 that it's NOT an '84MY engine. The question was deceptive but yes an '84MY camshaft has the fuel pump drive lobe.
11-04-2012, 10:43 PM
#10
Race Director
My early '86 has a plate bolted to the area where the fuel pump used to be. There are some brackets there that hold the fuel lines.
The question I would have is: is there physically enough room to mount a fuel pump without interference from the frame, suspension, etc.
The question I would have is: is there physically enough room to mount a fuel pump without interference from the frame, suspension, etc.
11-04-2012, 10:55 PM
#12
Team Owner
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St. Jude Donor '05
The question I would have is: is there physically enough room to mount a fuel pump without interference from the frame, suspension, etc.
mech pump will fit the 400 itself no problem.
Carter makes a real reliable piece. Hate electric fuel pumps unless you just have to have one
11-04-2012, 11:09 PM
#13
Melting Slicks
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Throttle body in tank pumps are in the 14# range, TPI & up engines are in the 40# range.
If any pump is still in the tank but power is disconnected so it does not operate an outboard pump will not pull fuel through it.
Suggest a throttle body in tank pump & fuel pressure regulator. The stock bypass line to the tank should be large enough with the described system. It is large enough for 84 models with throttle bodies.
If any pump is still in the tank but power is disconnected so it does not operate an outboard pump will not pull fuel through it.
Suggest a throttle body in tank pump & fuel pressure regulator. The stock bypass line to the tank should be large enough with the described system. It is large enough for 84 models with throttle bodies.
11-05-2012, 11:23 AM
#14
Race Director
When I carbed my 84, I mounted my Holley blue pump where this accel pump is mounted now.
11-15-2012, 06:41 PM
#15
There is no need to have more than 6-7 lbs. of pressure to your carb for street and mild strip use. Like stated above, why not use the stock intank 15 lb. pump?? Why do you think that the return line is not big enough?? I have a carbed 84 and am using the stock pump and a Mallory 4309 FPR adjusted to 5.5 lbs. I have had bad luck with Holley elec. pumps and I use the old Carter 4070 elec. pump on my 65 GTO , 455 with dual 600 carbs and over 400 hp with 6 psi to the carbs with no problems. Also run the same Carter pump on my 78 Ford Ranchero with a 460, single 750 Edel carb and over 400 hp with 6 psi and no problems. You can pulll fuel through a non working intank fuel pump but it is not the best thing. I have a cheapo AC delco external elec. pump that I carry in case my intank takes a dump. It takes me less than 10 minutes to hook up at the carb so that at least I can get home or to somewhere I can replace the intank pump. I measured about 4 psi pulling through the dead pump(I have an on/off safety switch for the intank pump). There is a lot of engine heat in your C4 and those mechanical pumps can boil your fuel so I say keep the intank 15 psi unit or replace it with a 6 psi intank from a carbed vehicle. If you are set on an electric external pump then remove the intank and mount the external pump in back.
03-31-2013, 11:57 PM
#16
Intermediate
84 fuel pump C4
There is no need to have more than 6-7 lbs. of pressure to your carb for street and mild strip use. Like stated above, why not use the stock intank 15 lb. pump?? Why do you think that the return line is not big enough?? I have a carbed 84 and am using the stock pump and a Mallory 4309 FPR adjusted to 5.5 lbs. I have had bad luck with Holley elec. pumps and I use the old Carter 4070 elec. pump on my 65 GTO , 455 with dual 600 carbs and over 400 hp with 6 psi to the carbs with no problems. Also run the same Carter pump on my 78 Ford Ranchero with a 460, single 750 Edel carb and over 400 hp with 6 psi and no problems. You can pulll fuel through a non working intank fuel pump but it is not the best thing. I have a cheapo AC delco external elec. pump that I carry in case my intank takes a dump. It takes me less than 10 minutes to hook up at the carb so that at least I can get home or to somewhere I can replace the intank pump. I measured about 4 psi pulling through the dead pump(I have an on/off safety switch for the intank pump). There is a lot of engine heat in your C4 and those mechanical pumps can boil your fuel so I say keep the intank 15 psi unit or replace it with a 6 psi intank from a carbed vehicle. If you are set on an electric external pump then remove the intank and mount the external pump in back.