Help with a barn find
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7th Gear
Joined: Oct 2023
Posts: 7
Likes: 0
Help with a barn find
Hello all, after hours of research I feel like my head is gonna explode. I keep going in circles so I have some questions.
Just purchased a 1989 F350 lariet Drw with the 7.5. 40k miles and super clean. However it’s been sitting for 10 years.
got a battery in it and found crank no start. No fuel pressure at the rail so tested high pressure pump on the frame. No dice. Bought a new one, can hear it kick on now but no start. Pulled the feed line and ran it into a gas can, started right up. So at this point it’s either the dual tank reservoir or the in tank pumps.
what’s the easiest course of action here?
Bypass the reservoir and run straight to one tank? Replace the reservoir at another $100+ I did pull both feed lines that go to the reservoir from each tank and cycled the ignition, neither pushed any gas. Do I need the reservoir? Just trying to minimize throwing parts at this.
Just purchased a 1989 F350 lariet Drw with the 7.5. 40k miles and super clean. However it’s been sitting for 10 years.
got a battery in it and found crank no start. No fuel pressure at the rail so tested high pressure pump on the frame. No dice. Bought a new one, can hear it kick on now but no start. Pulled the feed line and ran it into a gas can, started right up. So at this point it’s either the dual tank reservoir or the in tank pumps.
what’s the easiest course of action here?
Bypass the reservoir and run straight to one tank? Replace the reservoir at another $100+ I did pull both feed lines that go to the reservoir from each tank and cycled the ignition, neither pushed any gas. Do I need the reservoir? Just trying to minimize throwing parts at this.
Thread Starter
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7th Gear
Joined: Oct 2023
Posts: 7
Likes: 0
So high pressure pump in tank and remove external reservoir and high pressure external pump? Does the voltage and signal that goes to the tank for the low pressure pump work for the high pressure pump?
Hotshot
Joined: Jun 2015
Posts: 12,838
Likes: 2,437
Hello all, after hours of research I feel like my head is gonna explode. I keep going in circles so I have some questions.
Just purchased a 1989 F350 lariet Drw with the 7.5. 40k miles and super clean. However it’s been sitting for 10 years.
got a battery in it and found crank no start. No fuel pressure at the rail so tested high pressure pump on the frame. No dice. Bought a new one, can hear it kick on now but no start. Pulled the feed line and ran it into a gas can, started right up. So at this point it’s either the dual tank reservoir or the in tank pumps.
Do I need the reservoir? .
Just purchased a 1989 F350 lariet Drw with the 7.5. 40k miles and super clean. However it’s been sitting for 10 years.
got a battery in it and found crank no start. No fuel pressure at the rail so tested high pressure pump on the frame. No dice. Bought a new one, can hear it kick on now but no start. Pulled the feed line and ran it into a gas can, started right up. So at this point it’s either the dual tank reservoir or the in tank pumps.
Do I need the reservoir? .
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7th Gear
Joined: Oct 2023
Posts: 7
Likes: 0
Just so I understand, you ran the feed from the high pressure pump into a gas can and it started? Do you have power at the tank pumps? I doubt you need the DFR but it’s hard to say since you seem to be saying that the tank pumps aren’t working. The high pressure pump isn’t able to pull the fuel from the selected tank to know. The tank pumps supply fuel to the high pressure pump and force the DFR to change position.
And then you get to deal with defective check valves.
And then you get to deal with defective check valves.
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Hotshot
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Lead Driver
Joined: Feb 2002
Posts: 7,962
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From: Greater Austin, Texas
So high pressure pump in tank and remove external reservoir and high pressure external pump? Does the voltage and signal that goes to the tank for the low pressure pump work for the high pressure pump?
Yes and yes.
Laughing Gas
Joined: Oct 2013
Posts: 947
Likes: 6
From: Manitoba, Canada
You're thinking of removing the reservoir and the high pressure pump on the rail and running one tank with the 1990+ high pressure pump in the one tank?
I think I read somewhere that the newer high pressure pumps have a different sized mounting hole. Not 100% sure though. If true you can buy a complete 90+ rear tank/fuel pump assembly complete from Rockauto for about $200.
I think I read somewhere that the newer high pressure pumps have a different sized mounting hole. Not 100% sure though. If true you can buy a complete 90+ rear tank/fuel pump assembly complete from Rockauto for about $200.
Mountain Pass
Joined: Jan 2014
Posts: 214
Likes: 37
From: Madison Ohio
You're thinking of removing the reservoir and the high pressure pump on the rail and running one tank with the 1990+ high pressure pump in the one tank?
I think I read somewhere that the newer high pressure pumps have a different sized mounting hole. Not 100% sure though. If true you can buy a complete 90+ rear tank/fuel pump assembly complete from Rockauto for about $200.
I think I read somewhere that the newer high pressure pumps have a different sized mounting hole. Not 100% sure though. If true you can buy a complete 90+ rear tank/fuel pump assembly complete from Rockauto for about $200.
Logistics Pro
Joined: Dec 2003
Posts: 3,778
Likes: 863
From: Foothills of NC
I threw my rear tank and DFR away years ago. Rear tank was rusted out and the DFR was sending fuel to it.
Kept all original pumps and tank in front, and spliced OE type fuel lines between where I cut the fuel line in front of the DFR and at the fuel tank.
Been working great for well over 10 years now.
Kept all original pumps and tank in front, and spliced OE type fuel lines between where I cut the fuel line in front of the DFR and at the fuel tank.
Been working great for well over 10 years now.
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