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Old 02-02-2005, 02:07 PM
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Fuel pressure

I've got a customer with a dual tank set up on his classic ford pick up with fuel injected 302 and 89 ford frame, basicly older body on newer frame. I haven't seen this truck yet so I can't give more info then what I have. Nor has this guy actually built the thing but bought from a property auction some years ago. Does anyone have any experiance dealing with these dual tank set ups? He complains that the truck won't run off of the front tank because he believes the guy that told him the pump has bit it. When using the rear tank it will run okay but it drips fuel from near the top of the tank unless the filler cap is open. If the filler cap is open fuel dribbles out the filler neck.

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Old 02-02-2005, 03:45 PM
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Not sure on those tanks. Truck tanks at work have a crossover on them.You fill one and then the other side. When the primary side drops,the secondary will transfer to it to fill it up since it just pulls from one side. If the tanks check valve goes bad from the between the two. The secondary will keep filling from a syphon effect. The tank on your customers truck definently needs replaced if it is leaking around a seam..,Check and see if there is a vent for the tank and it may be clogged,forming a type of back presure and forcing the fuel out. let us know what you find definentlly.Got me real curious.
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Old 02-02-2005, 03:54 PM
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I don't think the older ford's had the cross over but could be switched by a switch in the cab. Could be wrong though. Maybe the front tank doesn't work cause of a bad switch?
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Old 02-02-2005, 06:49 PM
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ford fuel pumps often go bad, switch it to the front tank and have someone turn on the key and listen for the pump. if you don't here it, have someone turn on the key and check for power at the connector at the tank. if you have power it's the pump, if no power it will be the switch or wiring. keep in mind, you only have about 2 seconds to check for power or listen for the pump untill the relay shuts it off. then you have to wait about 10 seconds to recycle the key. hope this helps . good luck.
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Old 02-02-2005, 08:01 PM
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Yeah... that helps a lot. I can't wait to see it for myself. I've always had a soft spot for older chassis with modern drivelines. I was thinking of a bypass or tee in the line leaking too. I can't say how bad it's leaking. He said he driven it a short distance before. It'll at least run that well on the rear tank but not at all on the front. You wouldn't suppose the front pump has a oneway clutch so the pump vanes freewheel while the rear pump provides fuel would you? How about another theory? The rear pump fills the front tank only while the front pump provides volume to the rails? How do these dual tanks operate anywhoo?
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Old 02-02-2005, 11:21 PM
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Id first see that each tank has a seperate pump. There may be one single pump after the selector valve (ford had a specific name for these but I cant remember what. Im thinking Spider valve but I might be thinkin brakes). There may be a feeder pump and then a pusher pump but the first thing I'd be checking is that selector valve.
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Old 02-03-2005, 06:05 PM
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if it is a original 1989 ford setup, it will have a pump in each tank. in around those years some had a high pressure pump on the frame just ahead of the front tank, if this is the case, the pumps in the tanks are low pressure. the only way the tanks are connected is through the front and rear selector valve. i really don't see how the rear pump can fill the front tank, but stranger have happened. good luck
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Old 02-03-2005, 09:37 PM
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I believe those late 80s fords had a pump in each tank. The selector didn't do the actual switching. It just reacted to pressure and switched accordingly. I would guess that the front pump is no good.
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