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  #16  
Old 11-04-2012, 03:47 PM
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Okay someone shoot me if I am off base with this thinking, let say the lift pump is bad. What parts can be taken out so the electric fuel pump will take its place for delivering fuel to the IP.

My thinking is, since the main purpose is to deliver fuel to the IP, why not just "gut it" so what it is aflow through and let the electric fuel pump do the delivering of the fuel to the IP.

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  #17  
Old 11-04-2012, 04:10 PM
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Originally Posted by WMO Madness View Post
Okay someone shoot me if I am off base with this thinking, let say the lift pump is bad. What parts can be taken out so the electric fuel pump will take its place for delivering fuel to the IP.

My thinking is, since the main purpose is to deliver fuel to the IP, why not just "gut it" so what it is aflow through and let the electric fuel pump do the delivering of the fuel to the IP.
Electric pumps are far less reliable than the original lift pump. Also with electrical failure. Using an electric pump will not allow the car to run after the battery runs down.

The lift pump existing is an excellent well though out very reliable design and easy to recondition to get it back to what it should be if it is deficient. Some cars using wvo seem to require a booster pump at the tank end of the system. If you are regularily using wvo does add some varience to the issue by the way.
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  #18  
Old 11-04-2012, 04:25 PM
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Quote:
Originally Posted by WMO Madness View Post
My thinking is, since the main purpose is to deliver fuel to the IP, why not just "gut it" so what it is aflow through and let the electric fuel pump do the delivering of the fuel to the IP.
Why use the mechanical pump at all? Just bypass it completely.

(Which is not to say that I recommend the electric pump.)
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  #19  
Old 11-04-2012, 04:27 PM
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Originally Posted by barry12345 View Post
Electric pumps are far less reliable than the original lift pump. Also with electrical failure. Using an electric pump will not allow the car to run after the battery runs down.

The lift pump existing is an excellent well though out very reliable design and easy to recondition to get it back to what it should be if it is deficient. Some cars using wvo seem to require a booster pump at the tank end of the system. If you are regularily using wvo does add some varience to the issue by the way.
I am using wasge motor oil (WMO) as fuel, 80% now that it is getting cold.
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  #20  
Old 11-05-2012, 03:13 AM
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Originally Posted by qwerty View Post
Why use the mechanical pump at all? Just bypass it completely.

(Which is not to say that I recommend the electric pump.)
X2

Indeed just run a pump between supply and the input to the IP

I think in the long term you should remove the mechanical pump and blank the hole on the IP because I'm not sure how much the mechanical pump relies upon diesel to lubricate it - having the mechanical pump seizing on the side of the IP probably won't be ideal...
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  #21  
Old 11-05-2012, 03:46 AM
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Quote:
Originally Posted by Army View Post
X2

Indeed just run a pump between supply and the input to the IP

I think in the long term you should remove the mechanical pump and blank the hole on the IP because I'm not sure how much the mechanical pump relies upon diesel to lubricate it - having the mechanical pump seizing on the side of the IP probably won't be ideal...
Just loop a hose on the pump.
Residual fuel in the pump is enough to lubricate the plunger floating no load.


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  #22  
Old 11-05-2012, 07:49 AM
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Originally Posted by whunter View Post
Just loop a hose on the pump.
Residual fuel in the pump is enough to lubricate the plunger floating no load.


.
Do you have a rough drawing as an example? Thank you!
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  #23  
Old 11-05-2012, 10:51 AM
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I think he meant looping a hose between the input and output ports. The residual fuel/diesel will be pumped around the pump and lubricate it. May be add a little bit of fuel to the hose if necessary.
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  #24  
Old 11-05-2012, 02:51 PM
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Right on this!

Quote:
Originally Posted by barry12345 View Post
The lift pump existing is an excellent well though out very reliable design and easy to recondition to get it back to what it should be if it is deficient. Some cars using wvo seem to require a booster pump at the tank end of the system.
Far less head aching in sorting out any problems with the stock set up. VO and two tank set ups can benefit from a small electric boost pump for priming purposes.

Using an electric pump set up to "overfuel" the system, in that pump up the max load input pressure to say 30psi, is something that may be beneficial. There are threads on the forum with that discussion.
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  #25  
Old 11-05-2012, 07:52 PM
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Yes

Quote:
Originally Posted by ah-kay View Post
I think he meant looping a hose between the input and output ports. The residual fuel/diesel will be pumped around the pump and lubricate it. May be add a little bit of fuel to the hose if necessary.
That is correct.


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  #26  
Old 11-05-2012, 08:27 PM
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Originally Posted by whunter View Post
That is correct.


.
My sincere apologies for dragging this on, but I want make sure I have the right deal for this "looping" techniques. Hopefully I've illustrateded it correctly in the attached photo, the only thing difference is the prime on my lift pump is on the outboard side vice the inboard side due to mine is an older version. If I am on the right track here, I will focus on this MOD tomorrow. Thank you for veryone's patient. Because ever since I've intalled this electric fuel pump the car runs smooth, accel better and starts faster.
Attached Thumbnails
Lift Pump/Prime pump-slide1.jpg  
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  #27  
Old 11-05-2012, 08:40 PM
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Originally Posted by WMO Madness View Post
My sincere apologies for dragging this on, but I want make sure I have the right deal for this "looping" techniques.
Why waste horsepower driving a pump that does nothing useful? Remove the pump, fabricate a cover plate and be done with it.
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  #28  
Old 11-05-2012, 11:05 PM
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Answer

Quote:
Originally Posted by WMO Madness View Post
My sincere apologies for dragging this on, but I want make sure I have the right deal for this "looping" techniques. Hopefully I've illustrated it correctly in the attached photo, the only thing difference is the prime on my lift pump is on the outboard side vice the inboard side due to mine is an older version. If I am on the right track here, I will focus on this MOD tomorrow. Thank you for everyone's patient. Because ever since I've installed this electric fuel pump the car runs smooth, accel better and starts faster.
Post the picture without text boxes.

It looks correct, but the text box covers what I need to see.


.
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  #29  
Old 11-05-2012, 11:41 PM
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Originally Posted by qwerty View Post
Why waste horsepower driving a pump that does nothing useful?
Remove the pump, fabricate a cover plate and be done with it.
Not everyone has the skill to make the plate.
Many don't have the extra money to have the plate made.
A looped hose is cheap.
There is NO horsepower gain on a stock injection pump.


.
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  #30  
Old 11-05-2012, 11:58 PM
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Quote:
Originally Posted by whunter View Post
There is NO horsepower gain on a stock injection pump.
The laws of physics suggest otherwise. The gain might not be of any great consequence, but it isn't zero.

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