92 F-150 Shut off going down the road
#46
01-05-2018, 02:20 PM
Hotshot
Be aware you cannot leave the rear fuel tank lines uncapped. The check valves to prevent back flow are located in each tank. With no lines attached to the rear fuel delivery module the output from the front tank will run out the open rear tank fuel line. If any fuel did make it to the engine the return fuel will also dump out onto the ground.
#47
01-05-2018, 03:18 PM
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Update
SHES ALIVE
Thx to all members for lending a piece of there knowledge to help out a fellow truck owner.
Path I followed:
- Is there air? Yes
- Is there spark? Yes
- Is there fuel? No (Checked at fuel rail + starting fluid would spark but truck wouldn't stay running)
- Checked fuses
- Checked fuel/pcm relay by swapping w/ horn relay
- Obtained a wiring diagram for the fuel system.
- Checked power to inertia switch. Good
- Checked power to fuel switch inside cab: Good
- Checked power after fuel switch for rear tank: Good
- Checked power after fuel switch for midship tank: Good
- Checked power after the midship tank pump assembly (Orange wire from pump assembly): No Power
- Dropped midship/rear tanks along with pulling fuel pump assemblys
- Dismantled pump assembly's to get into the actually pump(s) and swapped rear for front.
- Reinstalled both tanks
- Sprayed some starting fluid into the valve body and SHES ALIVE
- Is there air? Yes
- Is there spark? Yes
- Is there fuel? No (Checked at fuel rail + starting fluid would spark but truck wouldn't stay running)
- Checked fuses
- Checked fuel/pcm relay by swapping w/ horn relay
- Obtained a wiring diagram for the fuel system.
- Checked power to inertia switch. Good
- Checked power to fuel switch inside cab: Good
- Checked power after fuel switch for rear tank: Good
- Checked power after fuel switch for midship tank: Good
- Checked power after the midship tank pump assembly (Orange wire from pump assembly): No Power
- Dropped midship/rear tanks along with pulling fuel pump assemblys
- Dismantled pump assembly's to get into the actually pump(s) and swapped rear for front.
- Reinstalled both tanks
- Sprayed some starting fluid into the valve body and SHES ALIVE
#50
01-06-2018, 02:27 PM
Join Date: Jan 2018
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#51
01-06-2018, 02:29 PM
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That is a vacuum line that is plugged into the manifold. There is no electronic pressure control. As the manifold vacuum decreases the pressure regulator increases the fuel pressure. Strictly mechanical/pneumatic.
Be aware you cannot leave the rear fuel tank lines uncapped. The check valves to prevent back flow are located in each tank. With no lines attached to the rear fuel delivery module the output from the front tank will run out the open rear tank fuel line. If any fuel did make it to the engine the return fuel will also dump out onto the ground.
Be aware you cannot leave the rear fuel tank lines uncapped. The check valves to prevent back flow are located in each tank. With no lines attached to the rear fuel delivery module the output from the front tank will run out the open rear tank fuel line. If any fuel did make it to the engine the return fuel will also dump out onto the ground.
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