Dual Inlet Fuel Pump: One inlet capped ???? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-29-2008, 06:45 AM
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Dual Inlet Fuel Pump: One inlet capped ????

I noticed that the mechanical fuel pump on the 350 that I recently put in my impala has "dual inlets". At least that's what I think it is.....

Can someone give me some insight as to what the secondary inlet is for? Is it a vacuum line or is the fuel pump for a dual tank application ?

Currently one inlet is capped off.


Here's a pic of it..

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Old 07-29-2008, 06:50 AM
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I think I figured it out... I searched the archives and someone stated that it could be an overflow line that runs back to my fuel tank....
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Old 07-29-2008, 08:20 AM
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i just replaced one on my friends 79 chevy truck and the motor came out of a 76 impala and it had the dual inlet line. It was just some sort of vent. His truck has dual tanks but the lines joined way before the fuel pump. We ended up replacing it with one that had the single inlet because the old one was bad. It works just fine.
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Old 07-29-2008, 08:22 AM
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This is not "dual inlet". One is the inlet and one is the return to the tank. If your vehicle doesn't have a fuel return line, you can just cap that one.
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Old 07-29-2008, 08:59 AM
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Quote:
Originally Posted by joe_padavano
This is not "dual inlet". One is the inlet and one is the return to the tank. If your vehicle doesn't have a fuel return line, you can just cap that one.

Thanks for your input. I'm just gonna leave it capped for now since I know it's just a return. I just hope the pump actually works. When i bought the rebuilt motor it was on a run stand. The guy started it for me and it worked just fine. The primary inlet was feeding from a 2 gallon container so I know the pump worked. However this was Nov 06'. Its been sitting for nearly two years. Always kept fresh oil and turned the crank at least once a week so it wouldn't lock up on me.

After I installed the motor last week I made sure all the fuel lines were hooked up (except the second inlet in question) and gave the carb some "gas" but noticed the fuel wasn't pouring into the filter chamber. Could this be a sign of the fuel pump being bad? Or will it start to pump when the motor cranks up?
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Old 07-29-2008, 01:35 PM
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I don't like your choice of fuel filter, nor do I like the location of it. If you were to have an accident where you were hit in the right front corner, could you imagine the plastic case of the fuel filter rupturing and spraying gas all over a very hot exhaust manifold.

Use a metal cased fuel filter, less chance of mechanical damage. I you want a filter before the pump install it close to the tank. Use an appropriate fuel line and clamps to prevent leaks.

You didn't say what kind of car you have the engine in, maybe you have a return line back to the tank!!!
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Old 07-29-2008, 02:06 PM
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I agree that the filter probably isn't in the best location, but it's been working fine like that for a year. And luckily i haven't had any car accidents...I'll definately consider relocating it further back away from the headers as you suggested. Thanks for the tip.

The car is a 68' Impala fastback. Definately not a hot rod, but a classic none the less.




I just painted the firewall and inner fender wells two weeks ago. Swapped out the old beat up 307 and dropped in the 350...

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Old 07-29-2008, 02:17 PM
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Nice ride, Hydraulics?
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Old 07-29-2008, 02:32 PM
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Quote:
Originally Posted by Double_v23
Nice ride, Hydraulics?
yes. Two pumps, 6 batteries.
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