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09-23-2012, 07:27 PM | #1 |
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Electric fuel pump with a mechanical one problems
I wanted to do the same thing which is setup in my coupe, flip on the mechanical pump first after the car has been sitting for a few days, start it, then flip off the electric pump. But, I'm using a cheap pump and wanted to get a better one that I can depend on if my mechanical pump dies.
My idea - I have both pumps installed - from the tank I have a T fitting, one line goes around the electric pump, the other to the pump, there's another T fitting on the other side of hte pump where the line exiting the pump and the line that did not go to the pump come together. My pproblem - I can't get gas through the engine mechanical pump with the electric pump running. I pinched off the by-pass line from the tank and I got fuel to the fuel bowl of the engine mech pump but nothing comes out of the mechanical pump up to the carbs as I turn the engine over whether the electric pump is running or not. I think it's the nature of the electric pump I'm using - my coupe has a cheapo electric pump from Advance "in-line" out of the gas tank and both the flattie and electric pump operate normally/as descibed above. The cheapo pump is electronic or pulse operated while the pump I'm using on my roadster is somethng different - kind of like a whine? Anyway, I'm going to get rid of the T-fitting setup and use a cheapo pump, setting it up likes it is in my coupe - I'll keep you posted. Any ideas why the pump I'm using would not work? |
09-23-2012, 07:57 PM | #2 |
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Re: Electric fuel pump with a mechanical one problems
I have a cylindrical electric fuel pump(AC) and a Speedway mechanical pump on my flathead.I use the elec to fill the bowls when the car has been sitting for over a week without starting.I then turn the elec pump off and start the car normally.Never had a problem so far.
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09-23-2012, 08:08 PM | #3 |
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Re: Electric fuel pump with a mechanical one problems
Like Deuce Lover, I use the electric inline pump momentarily to prime the mechanical pump. No problems at all. I am using the Airtex E8902 6volt, low pressure pump. Works great! Pat
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09-23-2012, 08:08 PM | #4 |
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Re: Electric fuel pump with a mechanical one problems
FWIW, I use the stock mechanical pump in conjunction with a 6v Airtex E-8011 electric pump on a single fuel line. The Airtex is used mainly for priming, but has been handy as a backup several times when the mechanical pump had problems. The Airtex allows the mechanical pump to pull through freely when not in use. Believe the 12v version of the Airtex pump is E-8012.
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09-23-2012, 08:15 PM | #5 |
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Re: Electric fuel pump with a mechanical one problems
Tom,
If you decide at some point to upgrade your electric pump I strongly recommend the POSI-FLO pump. It is electronic, and has a composite body. On 2x2 installations I use their 4 to 7 psi pump with no regulator required. With 2 2's the pump delivers a steady 3 psi with no issues. I purchase these little dudes at Carquest....#41-510. POSI-FLO also makes a lower pressure pump #41-509. Charlie ny |
09-24-2012, 05:12 AM | #6 | |
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Re: Electric fuel pump with a mechanical one problems
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09-24-2012, 06:24 AM | #7 |
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Re: Electric fuel pump with a mechanical one problems
I use the Airtex in line pump same as Duece lover & Pat/ohio works very well.
Gary. |
09-24-2012, 07:14 AM | #8 |
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Re: Electric fuel pump with a mechanical one problems
Thanks fellas - yes, my idea is to prime the carbs first to avoid excessive cranking. I'm going back to the tried and true method of being inline.
51 Merc, I think you are right about that. Now my car is going in circles just like me - LOL! I'll check into the Carquest unit, Charlie ... I need 12 volt unit .... Thanks again everyone! The Fordbarn at its best .... |
09-24-2012, 10:11 AM | #9 |
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Re: Electric fuel pump with a mechanical one problems
Your simplest fix is to leave everything just like it is but add a check valve in your line that bypasses the electric pump to allow fuel to only go toward the engine. That way when the electric pump is pumping it will keep the fuel from just recirculating back around but allow the mechanical pump to pump the fuel past the electric pump when it's not on. See 41Fordor's #4 on this thread: https://www.fordbarn.com/forum/showthread.php?t=81408
Here's his picture that illustrates his installation:
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09-24-2012, 10:57 AM | #10 |
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Re: Electric fuel pump with a mechanical one problems
Some electric pumps will feed through when not running, others will not. I went through the same selection process, and I can recommend from experience what I'm using.
This is a Facet 40106 recommended for experimental aircraft use. I bought it from Aircraft Spruce & Specialty for about $33, http://www.aircraftspruce.com/catalo...facetpumps.php Even with my fairly hairy 276's 500 cfm four-barrel, the stock mechanical pump has no trouble at all pulling enough fuel from the tank for high-speed highway driving. Mine's 12 volts, but I think Facet also make 6-volt versions. |
09-24-2012, 11:21 AM | #11 |
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Re: Electric fuel pump with a mechanical one problems
I will be starting my engine up soon and have a mechanical pump only. A friend told me to put a rag around an air hose and stick it in the tank fill opening. That will push the gas to the pump and eliminate unnecessary cranking. Any thoughts there?
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09-24-2012, 11:36 AM | #12 |
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Re: Electric fuel pump with a mechanical one problems
Yes this will work. I recently helped a friend drain a half tank of gas that had been in this 74 Chrysler for years. We disconnected the gas line at the fuel pump and all the gas was forced out. Now that I think about it, it may not work with the gas line still connected.??
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09-24-2012, 02:01 PM | #13 |
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Re: Electric fuel pump with a mechanical one problems
Old Henry - a picture IS worth a 1000 words. I'm basically set up the exact same way, just more over the rear crossmember. I'm also 12 volts, Richard and thank you for the pump suggestion - I just ordered one and a check valve so, we'll see where that leads me.
Thanks again, gents - great info here .... |
09-24-2012, 02:10 PM | #14 |
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Re: Electric fuel pump with a mechanical one problems
That little pump is amazing.
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09-24-2012, 07:18 PM | #15 | |
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Re: Electric fuel pump with a mechanical one problems
Quote:
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09-24-2012, 08:55 PM | #16 |
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Re: Electric fuel pump with a mechanical one problems
Tom - a check valve set, up as mentioned previously, is absolutely necessary to make your system work right. Lots of good info - and pix - here. Good luck!
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09-24-2012, 09:49 PM | #17 |
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Re: Electric fuel pump with a mechanical one problems
Where can I buy that bypass check valve? any part number?
Thanks in advance... |
09-25-2012, 02:38 AM | #18 |
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Re: Electric fuel pump with a mechanical one problems
I use the 12v version of the Airtex pump (E-8012) that I get from AutoZone on a number of my cars. Stock mech pumps have pulled gas thru them without incident over the years on a number and variety of old Fords. Put the pump near the tank.
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09-25-2012, 10:12 AM | #19 |
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Re: Electric fuel pump with a mechanical one problems
That is not my set up. I was just showing 41Fordor's solution to the Carter pump. I use the Airtex that the mechanical pump can pull through. Much simpler installation. No need for bypass line with check valve.
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Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 02-18-2013 at 12:07 AM. |
09-25-2012, 12:21 PM | #20 |
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Re: Electric fuel pump with a mechanical one problems
JDI- E- Bay
AIRTEX E8902 6 VOLT FUEL PUMP 2.5-4psi LOW PRESSURE FUEL PUMP OR PRIMER PUMP
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