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Restoring f100, not getting fuel from main tank

 
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Old 01-20-2019, 02:49 PM
jaygee15
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Restoring f100, not getting fuel from main tank

So we're about 95% done with the restoration of our 73 F100 Ranger XLT with a 390, came Factory with dual tanks, we are not getting fuel from the main tank, only from the secondary. We had replaced the fuel selector valve cuz the original wasn't working, anybody got any idea what's going on.
 
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Old 01-20-2019, 03:40 PM
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1973/74 F100/350's with factory installed dual fuel tanks have a manually operated fuel tank selector valve located adjacent to the drivers side of the seat.

The selector switch in the heater control panel only changes the dash fuel gauge from one tank to the other.
 
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Old 01-20-2019, 03:45 PM
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Originally Posted by NumberDummy View Post
1973/74 F100/350's with factory installed dual fuel tanks have a manually operated fuel tank selector valve located adjacent to the drivers side of the seat.

The selector switch in the heater control panel only changes the dash fuel gauge from one tank to the other.
Yes I know that. As stated, I replaced the selector valve.
 
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Old 01-20-2019, 05:00 PM
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Try backflushing the hard lines yet? Use shop air, not 120 psi but maybe 20 or 30
 
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Old 01-20-2019, 10:42 PM
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Originally Posted by jaygee15 View Post
Yes I know that. As stated, I replaced the selector valve.
I know you know, and I've known this for 44 years, but others may not be aware, because...

In 1975, Ford began using a fuel tank selector valve and solenoid assy mounted on the cross member.

The switch in the heater panel changes the tanks and the dash fuel gauge from one tank to the other.

Fuel starvation: On the end of the mid-ship and aft axle fuel sending unit pickup tubes is a 3/8" I.D. plastic meshed filter screen (D1AZ-9A011-A).

It can get clogged up with rust, scale and other foreign material that gets in the tanks.
 
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Old 01-20-2019, 10:48 PM
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Originally Posted by NumberDummy View Post

Fuel starvation: On the end of the mid-ship and aft axle fuel sending unit pickup tubes is a 3/8" I.D. plastic meshed filter screen (D1AZ-9A011-A).

It can get clogged up with rust, scale and other foreign material that gets in the tanks.
thank you. Where exactly is this located?
 
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Old 01-20-2019, 11:02 PM
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Originally Posted by jaygee15 View Post
thank you. Where exactly is this located?
Remove the mid-ship and/or aft axle sending unit, this 3/8" I.D. filter screen (D1AZ-9A011-A) slides onto the end of the pickup tube.

This filter will also be found on all 1971/79 FoMoCo Passenger Cars, Bronco's and Econolines.

The trucks with an in-cab tank don't have it, because the pickup tube is part of the tank, not part of the sending unit.

Note: There's also a 5/16" I.D. screen (D1FZ-9A011-A), but it was only used on Maverick/Comet/Pinto/Bobcat.
 
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Old 01-20-2019, 11:08 PM
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Originally Posted by Tedster9 View Post
Try backflushing the hard lines yet? Use shop air, not 120 psi but maybe 20 or 30
no I have not. Thank you
 
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Old 01-20-2019, 11:10 PM
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Originally Posted by NumberDummy View Post
Remove the mid-ship and/or aft axle sending unit, this 3/8" I.D. filter screen (D1AZ-9A011-A) slides onto the end of the pickup tube.

This filter will also be found on all 1971/79 FoMoCo Passenger Cars, Bronco's and Econolines.

The trucks with an in-cab tank don't have it, because the pickup tube is part of the tank, not part of the sending unit.

Note: There's also a 5/16" I.D. screen (D1FZ-9A011-A), but it was only used on Maverick/Comet/Pinto/Bobcat.
would that screen or filter have been part of the sending unit, both tanks were replaced including the sending units, the only thing that wasn't replaced were the fuel lines.
 
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Old 01-20-2019, 11:16 PM
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Have you took a peek inside the tank itself? Varnish and sludge cause mucho problems.
 
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Old 01-20-2019, 11:20 PM
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Originally Posted by jaygee15 View Post
would that screen or filter have been part of the sending unit, both tanks were replaced including the sending units, the only thing that wasn't replaced were the fuel lines.
Depends on where you bought the senders. I know genuine Ford would have them, but what came from auto parts stores, I dunno.

These screens were introduced in 1971, then Ford installed them on all the 'service part replacement' senders used 1957/79 (except 1957/77 trucks w/in-cab tanks).

For example, it you bought a C8ZZ-9275-C sender (1965/68 Mustang) after 1970, it had one.

btw: The fuel sending unit float is available separately and is the same for all 1957/79 Passenger Cars/Trucks, 1961/79 Econolines and 1966/79 Bronco's.
 
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Old 01-20-2019, 11:27 PM
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Originally Posted by Tedster9 View Post
Have you took a peek inside the tank itself? Varnish and sludge cause mucho problems.
they're both brand new tanks.
 
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Old 01-21-2019, 12:12 AM
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Since you are doing a resto and have installed new gas tanks with new senders, I highly recommend changing any old fuel hoses. One way of checking is to remove the fuel hose going to the non working tank at the fuel selector valve (make sure that this tank is the one supplying the truck). Siphon that hose until you get gas running out. Let it pour into a can for about 10 seconds to confirm flow. Hook it back up to the selector valve and try to start the truck. If you get nothing, then perhaps the issue is the suction line on the sending unit.
 
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Old 01-21-2019, 02:16 PM
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Originally Posted by 84espy View Post
Since you are doing a resto and have installed new gas tanks with new senders, I highly recommend changing any old fuel hoses. One way of checking is to remove the fuel hose going to the non working tank at the fuel selector valve (make sure that this tank is the one supplying the truck). Siphon that hose until you get gas running out. Let it pour into a can for about 10 seconds to confirm flow. Hook it back up to the selector valve and try to start the truck. If you get nothing, then perhaps the issue is the suction line on the sending unit.
great idea.. thanks .
 
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Old 01-25-2019, 12:54 AM
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Okay so I did a few troubleshooting steps to help figure things out. I first disconnected the hose from the main tank from the fuel selector valve and I was getting fuel there, but the truck would not stay running when I switched to the main tank, I then swapped the hoses on the fuel selector valve so that the main tank was where the reserve tank hose was, and again the truck would not stay running. So apparently I am not getting adequate fuel from the main tank.
 

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