Fuel Pick Up Problem???
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5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
Fuel Pick Up Problem???
I am working in a 7.3 NA in a 1989 F350 Crew Cab Dually with an Automatic Transmission.
My Problem is that the Pickup Pump(Mechanical Pump) is not Picking Up any Diesel. We put a New pump on the truck today, and it is still not picking up fuel. We hooked a Vacuum pump to the Fuel line that goes to the Fuel FIlter, and we could draw fuel up with it.
Anyone got any ideas as to what our problem might be?
My Problem is that the Pickup Pump(Mechanical Pump) is not Picking Up any Diesel. We put a New pump on the truck today, and it is still not picking up fuel. We hooked a Vacuum pump to the Fuel line that goes to the Fuel FIlter, and we could draw fuel up with it.
Anyone got any ideas as to what our problem might be?
Last edited by a_cmc_2b; Jan 1, 2020 at 08:21 PM. Reason: To edit post.
Thread Starter
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5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
How would we know if we did not have the "new pump installed Correctly"?
Thanks for our help...
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
a Faulty Select Valve can Restrict fuel Flow in both Supply and Return lines.. often pieces of the shower heads in the tanks can end up in the Select valve and cause issues.
when installing a Lift Pump I rotate the engine to TDC this puts the Cam lobe at the lowest point to install the pump, some folks have managed to get the lever above the Cam Lobe (Don't ask me how) but the lever on the pump needs to be below the Cam Lobe.
Using a Manual Vacuum Pump can Draw Fuel thru a partly clogged Valve where the Mechanical Lift pump Might not.
you could Test your newly installed Lift Pump by connecting a Line to the inlet into a bucket of Diesel... IF the problem is solved then you Know the issue is with Lines or the Select Valve.
when installing a Lift Pump I rotate the engine to TDC this puts the Cam lobe at the lowest point to install the pump, some folks have managed to get the lever above the Cam Lobe (Don't ask me how) but the lever on the pump needs to be below the Cam Lobe.
Using a Manual Vacuum Pump can Draw Fuel thru a partly clogged Valve where the Mechanical Lift pump Might not.
you could Test your newly installed Lift Pump by connecting a Line to the inlet into a bucket of Diesel... IF the problem is solved then you Know the issue is with Lines or the Select Valve.
Thread Starter
|
5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
a Faulty Select Valve can Restrict fuel Flow in both Supply and Return lines.. often pieces of the shower heads in the tanks can end up in the Select valve and cause issues.
when installing a Lift Pump I rotate the engine to TDC this puts the Cam lobe at the lowest point to install the pump, some folks have managed to get the lever above the Cam Lobe (Don't ask me how) but the lever on the pump needs to be below the Cam Lobe.
Using a Manual Vacuum Pump can Draw Fuel thru a partly clogged Valve where the Mechanical Lift pump Might not.
you could Test your newly installed Lift Pump by connecting a Line to the inlet into a bucket of Diesel... IF the problem is solved then you Know the issue is with Lines or the Select Valve.
when installing a Lift Pump I rotate the engine to TDC this puts the Cam lobe at the lowest point to install the pump, some folks have managed to get the lever above the Cam Lobe (Don't ask me how) but the lever on the pump needs to be below the Cam Lobe.
Using a Manual Vacuum Pump can Draw Fuel thru a partly clogged Valve where the Mechanical Lift pump Might not.
you could Test your newly installed Lift Pump by connecting a Line to the inlet into a bucket of Diesel... IF the problem is solved then you Know the issue is with Lines or the Select Valve.
Posting Guru
Joined: May 2015
Posts: 2,036
Likes: 5
You can also slide a hose over the inlet, have someone crank it while you hold your finger over the hose and make sure the pump has suction. These mechanical pumps really pull alot of vacuum.
Just make sure it's in neutral and you're out of the way of anything.
You probably got a dud pump.
Just make sure it's in neutral and you're out of the way of anything.
You probably got a dud pump.
Scope Wizard
Joined: May 2019
Posts: 6,530
Likes: 25
it is possible to get a DUD pump.. I generally test them by Hand first before I waste time installing in the first place 
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Thread Starter
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5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
You can also slide a hose over the inlet, have someone crank it while you hold your finger over the hose and make sure the pump has suction. These mechanical pumps really pull alot of vacuum.
Just make sure it's in neutral and you're out of the way of anything.
You probably got a dud pump.
Just make sure it's in neutral and you're out of the way of anything.
You probably got a dud pump.
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Thread Starter
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5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
Thanks Again...
Last edited by a_cmc_2b; Jan 2, 2020 at 09:19 AM. Reason: a 2 I
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
If you want to move your pump to the frame rail, you could install an electric fuel pump (like a facet duralift) instead of that mechanical lift pump. You'd need to put a block-off plate so you don't have a gaping hole in your crankcase, and you'd have to run some new fuel hose, but it's not that hard to do.
pros: no more cranking for bleeding the fuel. just flip a switch. also one less thing to have in your engine bay. also, one less thing attached to your cam. pre-filter is cleanable. easier to access for maintenance. makes fuel system troubleshooting 10000x easier.
cons: fuel supply doesn't match rpms, but if you make sure you get a good quality e-pump with gpm and good psi (4-7 or 7-9), that won't be a problem.
pros: no more cranking for bleeding the fuel. just flip a switch. also one less thing to have in your engine bay. also, one less thing attached to your cam. pre-filter is cleanable. easier to access for maintenance. makes fuel system troubleshooting 10000x easier.
cons: fuel supply doesn't match rpms, but if you make sure you get a good quality e-pump with gpm and good psi (4-7 or 7-9), that won't be a problem.
Thread Starter
|
5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
If you want to move your pump to the frame rail, you could install an electric fuel pump (like a facet duralift) instead of that mechanical lift pump. You'd need to put a block-off plate so you don't have a gaping hole in your crankcase, and you'd have to run some new fuel hose, but it's not that hard to do.
pros: no more cranking for bleeding the fuel. just flip a switch. also one less thing to have in your engine bay. also, one less thing attached to your cam. pre-filter is cleanable. easier to access for maintenance. makes fuel system troubleshooting 10000x easier.
cons: fuel supply doesn't match rpms, but if you make sure you get a good quality e-pump with gpm and good psi (4-7 or 7-9), that won't be a problem.
pros: no more cranking for bleeding the fuel. just flip a switch. also one less thing to have in your engine bay. also, one less thing attached to your cam. pre-filter is cleanable. easier to access for maintenance. makes fuel system troubleshooting 10000x easier.
cons: fuel supply doesn't match rpms, but if you make sure you get a good quality e-pump with gpm and good psi (4-7 or 7-9), that won't be a problem.
I also just checked out IDI Online, and it appears that site is going to provide some good reading and information,,,
Thread Starter
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5th Wheeling
Joined: Mar 2015
Posts: 45
Likes: 4
From: South Mississippi
Man it doesn't get much lazier than me, so I garontee ya, that in the future I will check all mechanical pumps before installing, regardless of what I am working on.
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