lift pump ?
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Cargo Master
Joined: Mar 2006
Posts: 2,789
Likes: 5
From: Sand GAp, KY
lift pump ?
Can anyone tell me if the manual lift pump on an 86 6.9 will pull the fuel past the electric pump in the tank (it is a high pressure unit)? I am putting the diesel in my 88 bronco (swapping whole drive train) and would like to keep the manual pump and use the in tank pump as a backup. I already have the bypass regulator on my truck due to haveing carbed the 302 in it now. Also thought the electric pump could be used to prime the system after filter changes etc..
Elder User
Joined: Jan 2008
Posts: 698
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From: Guymon
It depends on what type of pump it is. There are 2 different ones that I know of that I have taken apart. The only one I have taken apart out of a ford was a Gear rotor type pump, (A gear turning inside of a bigger gear) and I don't think it will pull fuel past this type of pump. The other style, Like most GM vehicles use, look somewhat like a turbine type pump. It has 2 turbins that turn on the same shaft and you can pull fuel past this pump. I Don't know how restrictive it is but I know a mechanical lift on the one I seen will pull it past it. (but like I said, i have only taken one ford pump apart and if its like the one I seen, It won't be able to pull fuel past it unless the pump is actually running.) I would just pull a vaccume or external fuel pump on the fuel line and see if it will pull the fuel past it. I have an external electric pump under the cab that vibrates back and forth. Don't know what type it is cause I never took one apart but it seems to work great and primes the fuel system great just like you mentioned in your post.. They sell them at parts stores for like $15-20.
Elder User
Joined: Mar 2008
Posts: 912
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From: Marianna, Florida USA
The electric fuel pump will push fuel through the mechanical pump, so you can keep both in the system. The type pump FORD MEGA CAB!!! is talking about is a solenoid pump that has a plunger in it that strokes at a set rate to pump the fuel. They are extremely durable.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
That pump in your tank without the regulater on it will put out around 90 pounds pressure. So even if it doesn't restrict fuel flow and I think it will be careful priming your system with it.
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
I used to have an aftermarket pump for this under the frame, just to prime fuel filters or if I ran out of fuel, but when my manual lift pump went out, and I replaced it with a brand new one that sucked air into the fuel lines, I bypassed it and installed a fuel pump off a 99 Powerstroke, which works great.
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Elder User
Joined: Mar 2008
Posts: 912
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From: Marianna, Florida USA
The in tank pump can still be used. If you put a resister in series with the pump, it will reduce the output pressure of the pump. A little experimenting with the resistance will be worth the effort. You'll have to use a 50Watt resister I'd estimate about a 10ohm resister to handle the load.
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Thread Starter
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Cargo Master
Joined: Mar 2006
Posts: 2,789
Likes: 5
From: Sand GAp, KY
I am already running a bypass regulator set at 7-9 psi for the carbed 302 that is in my bronco now so that part is covered. Can I route the bypass line into the bypass line for the injectors or the one coming out of the IP?
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
Dave, do you know how much pressure a Powerstroke pump has, I may need to do something about mine, It has been parked most of the time since I did this, and I don't need problems out of it.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
No idea on the Stroke pump.
I had a buddy that was having trouble with the EBPV on a 99 motor after turning it into a mud truck.
I did figure out how to disable the backpressure valve, but that was about as much as I wanted to see and figure out.
Part of that was because I was tired of standing on top of an 8 foot step ladder to see under the hood.
I had a buddy that was having trouble with the EBPV on a 99 motor after turning it into a mud truck.
I did figure out how to disable the backpressure valve, but that was about as much as I wanted to see and figure out.
Part of that was because I was tired of standing on top of an 8 foot step ladder to see under the hood.
