Electric Fuel Pump Question
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Senior User
Joined: Feb 2005
Posts: 185
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From: South Dakota
Electric Fuel Pump Question
I recently fixed my truck but i was wondering, my truck has an electric fuel pump it looks like a fuel filter from those 95 and up chevies (best way to describe it) but here's my problem when my gas gauge reads thats theres just enough gas in my truck where the needle is slightly up from the (E) and i start going down the road but my truck stalls but the gauge needle is still slightly away from (E) telling me that there's still enough gas but my truck still stalls. my gas tank is in the back of me or my seat i should say, i know there's still enough gas in there cause i pulled out the sending unit and found that there was still barely enough gas but you guys that have those gas tanks in behind the back seat is that normal for that to happen? or is my electric fuel pump not sucking up enough to get the gas at the bottom of the tank?
Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
Where is your electric fuel pump mounted?
It needs to be below your fuel tank so it pushes fuel, not pulls it. If it tries to pull the fuel, it will soon burn out from lack of cool fuel flowing through it.
The burnout is sometimes gradual, where stalling will occur now and then; Or, sudden death can occur with no chance of a restart.
It needs to be below your fuel tank so it pushes fuel, not pulls it. If it tries to pull the fuel, it will soon burn out from lack of cool fuel flowing through it.
The burnout is sometimes gradual, where stalling will occur now and then; Or, sudden death can occur with no chance of a restart.
Laughing Gas
Joined: Feb 2007
Posts: 821
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From: hohenwald, tn
my incab tank is a pain in the rear. (77 f350 ) i cannot let my tank go 100 miles without sputtering and "running" out of gas. i have assumed that the feed line has a pin hole in it. one day it was 4.? gallons down, a couple days it was just over 5 gallons down. now i drive local till my newer tank arrives.
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Senior User
Joined: Feb 2005
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From: South Dakota
Those type of fuel pumps, do they have enough sucking pressure to reach the gas tank in the back? for some odd reason my 300-6 does not have no mechanical fuel pump on the engine
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
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From: Hesperia, CA
The pickup tube in most of these tanks don't go all of the way to the bottom. They are just off of the bottom to keep from picking up crud off of the tank bottom. This does leave about a 1/4 inch of gas on the bottom. My 68 was like this, I don't know how many more were. (I didn't know 77's had an in cab gas tank)
My personal opinion would be to get that tank out of the cab and under the vehicle. I spent 10 years in the fire department and I saw first hand what can happen if you get in an accident and get trapped in the cab. You might at least have a chance if the tank is under the vehicle.
My personal opinion would be to get that tank out of the cab and under the vehicle. I spent 10 years in the fire department and I saw first hand what can happen if you get in an accident and get trapped in the cab. You might at least have a chance if the tank is under the vehicle.
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Senior User
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From: South Dakota
Yeah i know my brother in law said he wouldnt fill safe just sitting there with all that gas behind the back seat lol, i was wondering if that small electrical fuel pump would be able to suck the gas through the back tank or would i have to relocate it towards the rear of the tank?
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Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
Originally Posted by 77F-150
Yeah i know my brother in law said he wouldnt fill safe just sitting there with all that gas behind the back seat lol, i was wondering if that small electrical fuel pump would be able to suck the gas through the back tank or would i have to relocate it towards the rear of the tank?
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Actually the pump does not "suck" anything. Atmospheric pressure in the tank forces fuel in the tank thru the line into a void in the pump mechanism. If the fuel line inlet filter is not totally covered by fuel air will rush in to fill the pump void causing the pump to deliver air instead of fuel.
A fuel pump should be located as close to the tank as possible.
Remember- It is just as easy to keep the top half of the tank full as it is the bottom half!!! Always refill your tank before it reaches 1/4 full.
A fuel pump should be located as close to the tank as possible.
Remember- It is just as easy to keep the top half of the tank full as it is the bottom half!!! Always refill your tank before it reaches 1/4 full.
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
Originally Posted by Torque1st
Actually the pump does not "suck" anything. Atmospheric pressure in the tank forces fuel in the tank thru the line into a void in the pump mechanism. If the fuel line inlet filter is not totally covered by fuel air will rush in to fill the pump void causing the pump to deliver air instead of fuel.
A fuel pump should be located as close to the tank as possible.
Remember- It is just as easy to keep the top half of the tank full as it is the bottom half!!! Always refill your tank before it reaches 1/4 full.
A fuel pump should be located as close to the tank as possible.
Remember- It is just as easy to keep the top half of the tank full as it is the bottom half!!! Always refill your tank before it reaches 1/4 full.
And all this time when I put my finger over the inlet of an electric pump and it stuck, I thought it was suction. It turns out all this time that it was atmospheric pressure
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Originally Posted by wb6vvv
Gee, did we just get a lesson in advanced physics or what!
And all this time when I put my finger over the inlet of an electric pump and it stuck, I thought it was suction. It turns out all this time that it was atmospheric pressure
And all this time when I put my finger over the inlet of an electric pump and it stuck, I thought it was suction. It turns out all this time that it was atmospheric pressure
-Now somewhere deep in Jupiter or in the depths of the oceans here on Earth you can get some rather large vacuum readings...
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
One reason why the dash gauges are inaccurate is the gas tank sending unit floats. The floats are made from two pieces of copper soldered together. Over time, the solder breaks down, allowing gas to seep into the float. The float then settles to the bottom of the tank.
The floats are still available from Ford and were used on every Ford gas tank sender, car & truck from 1957 thru 1979.
C0AZ-9202-B .. Gas Tank Sender Float
C1TF-9276-A .. Gas Tank Sender Gasket - Use with bolt on sending units.
C0AF-9276-A .. Gas Tank Sender Gasket - "O" Ring type - use with senders that are held on by a twist off ring.
Note: The under bed gas tanks have a plastic mesh filter screen that slides over the end of the pickup tube. Most have never been changed, so many are partially/totally clogged up. It's still available from Ford.
D1AZ-9A011-A .. Plastic Mesh Filter Screen
Note: The in-cab gas tank sending unit assembly is still available from Ford. The same sender fits every in-cab tank from 1961 thru 1977.
D7TZ-9275-G .. Gas Tank Sender = In-Cab Gas Tank: 1961/77
The floats are still available from Ford and were used on every Ford gas tank sender, car & truck from 1957 thru 1979.
C0AZ-9202-B .. Gas Tank Sender Float
C1TF-9276-A .. Gas Tank Sender Gasket - Use with bolt on sending units.
C0AF-9276-A .. Gas Tank Sender Gasket - "O" Ring type - use with senders that are held on by a twist off ring.
Note: The under bed gas tanks have a plastic mesh filter screen that slides over the end of the pickup tube. Most have never been changed, so many are partially/totally clogged up. It's still available from Ford.
D1AZ-9A011-A .. Plastic Mesh Filter Screen
Note: The in-cab gas tank sending unit assembly is still available from Ford. The same sender fits every in-cab tank from 1961 thru 1977.
D7TZ-9275-G .. Gas Tank Sender = In-Cab Gas Tank: 1961/77
Last edited by NumberDummy; Jul 21, 2007 at 04:48 AM.