Depressurize Fuel System - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 10-02-2012, 05:59 PM Thread Starter
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Depressurize Fuel System

I converted to electronic fuel and need to adjust the length of my already connected feed line. I figured that disconnecting the electrical to the pump would depressurize the line, but somehow the engine was able to start up multiple times and run like a pump was never needed even though the regulator reads 0 psi.

With that said, here are my dumb questions:

How is that possible?

How do you properly depressurize an electronic fuel system?

Once depressurized, how can i rid of excess fuel in the lines so that I don't dump half a gallon on my face?
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post #2 of 7 (permalink) Old 10-02-2012, 06:09 PM
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Re: Depressurize Fuel System

there is no pressure if the pump is not running you only have the fuel that is in the line.just unhook the the line from what ever end you want to shorten it and let it run into a bucket or pail.

1997 f350 xlt regular cab 4x4,matercraft courser at2 285's, automatic,1.0 housing,ebpv delete housing and pedestal,tymar intake,diamond eye dp w/4 inch straight pipe,super duty starter,203* tstat
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post #3 of 7 (permalink) Old 10-02-2012, 06:29 PM Thread Starter
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Re: Depressurize Fuel System

Quote:
Originally Posted by sharpmotors View Post
just unhook the the line from what ever end you want to shorten it and let it run into a bucket or pail.
Last time i did that fuel poured out the lines all over the place and was hoping to avoid that because it's going to be hard enough to get the hose off. Oh well, I'll give it another whirl. Thanks.
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post #4 of 7 (permalink) Old 10-02-2012, 07:03 PM
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Re: Depressurize Fuel System

Clamp a pair of vice grips on the line you're going to shorten to keep it from running all over the place.
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post #5 of 7 (permalink) Old 10-02-2012, 09:18 PM Thread Starter
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Re: Depressurize Fuel System

Quote:
Originally Posted by csp View Post
Clamp a pair of vice grips on the line you're going to shorten to keep it from running all over the place.
Hmmm, simple and fairly obvious solution.... that I always seem to overlook.

Thanks!
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post #6 of 7 (permalink) Old 10-02-2012, 11:47 PM
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Re: Depressurize Fuel System

The 7.3's injectors can act like little pumps and still allow the pump to run even if there is no pressure in the fuel system. They'll essentially create a vacuum and pull fuel up from the tank. They'll idle all day, but won't do much more than that.

Jimmy
97 F-250 ECLB 7.3/E4OD/4wd, 215k miles: FFD 250/200%'s, Swamps IDM, built trans, shimmed 910's, Melling LPOP, welded cam gear/modified pick-up tube, Homemade e-fuel/intake/exhaust/traction bars, D66, Built and tuned by me

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post #7 of 7 (permalink) Old 10-03-2012, 12:37 AM Thread Starter
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Re: Depressurize Fuel System

Good to know. I bet my fuel pump had been toast for a while then.
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