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  #16  
Old 12-11-2007, 11:42 AM
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The pump doesn't supply the pressurized fuel...the injector pump does that. In this case, we just have to move low pressure fuel from the tank to the injector pump. In a fuel injection system, it would be delivering high pressure fuel directly to injectors.

I have pressurized the system and found no fuel leaking out at all. Keep in mind, it's much easier to leak air than fuel.


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Originally Posted by lowriderdog37 View Post
It's actually been a heck of a process so far. Here are the events so far:

1. saw air bubbles in the return hose.
2. hooked up clear hose to see that there is a leak after but not before the pump.
3. changed the crush-washers
4. totally routed the hoses around the pump, not using it (no air in return, ran fine, just lack of power)
5. put new pump on (now have the air leaking again)
This gives me a good idea that it's the pump.
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  #17  
Old 05-03-2009, 03:53 PM
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lowrider,

I am going to assume the bubbles were only noticed after breaching the half-tank mark, correct? Then the the lower your fuelr reserve became, the worse the air became?

I currently cannot run my tank down to less than 3 gallons before it starts stuttering.

Did you end up with an electric supplement or did you rebuild the pump (kit available from Fastlane)?

what model, if so?
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  #18  
Old 05-03-2009, 08:31 PM
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Does anyone have the part number for the cheap NAPA pump?
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  #19  
Old 05-03-2009, 09:04 PM
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I got a cheap pump, but it didn't flow enough fuel, and I was feeling it as I was driving. I ended up ignoring it, and it hasn't really caused me any problems, I just see bubbles coming through the return line.

I didn't notice a difference with now much fuel was in the tank. One thing to check though is to see if you are having a vacuum issue in the tank. Take the cap off when you are noticing bubbles and see if you hear the hiss.
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  #20  
Old 05-03-2009, 09:10 PM
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what was the pump's GPM, GPH or pressure max?
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  #21  
Old 05-03-2009, 09:13 PM
ForcedInduction
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Those little "thumper" pumps are barely useful for transferring fuel between tanks.
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  #22  
Old 05-03-2009, 09:22 PM
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Quote:
Originally Posted by jt20 View Post
what was the pump's GPM, GPH or pressure max?
Have no idea. It was a while back and it flopped immediately, all I can tell you is don't bother with a cheapie. ForcedInduction was working on an electric replacement, don't know what he found though.

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Originally Posted by ForcedInduction View Post
Those little "thumper" pumps are barely useful for transferring fuel between tanks.
Yes, but I didn't really have anything to loose.
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  #23  
Old 05-03-2009, 10:29 PM
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If you go to NAPA online and you can manage to find the pump it will tell you the Specs. I would be and Electric Fuel Pump that is priced in the $30-$50 range.
NAPA used to sell 3 electric pumps that couls withstand disel fuel. All of them can be found labled differently selling at other places.
I do not know about the flow but I do not believe any of them put out enough pressure to open the IP Over Flow Valve as they are mostly made for Gas Engines. So it will not work without the Stock Fuel Supply Pump.
Flow wise most of fuel volume is used to cool the IP that volume passes through the IP housing by way of the Over Flow Valve and back to the Fuel Tank.
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  #24  
Old 05-03-2009, 10:40 PM
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Originally Posted by Diesel911 View Post
So it will not work without the Stock Fuel Supply Pump.

I do not want to replace the lift pump, I want to supplement it.
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  #25  
Old 05-03-2009, 10:45 PM
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I do not want to replace the lift pump, I want to supplement it.
Why? If pressure is low, its time to stretch the relief spring and/or rebuild the check valves.
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  #26  
Old 05-04-2009, 12:19 AM
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Quote:
Originally Posted by jt20 View Post
...
I currently cannot run my tank down to less than 3 gallons before it starts stuttering.....

Something is wrong with your tank. Did you make sure your tank screen is clean and it is venting properly?
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  #27  
Old 05-04-2009, 01:01 AM
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The leaking air at the lift pump is likely due to a faulty/old primer pump that's venting air. Replace the primer pump with the modern version, and I bet the problems will go away. Lift pumps rarely fail.
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  #28  
Old 05-04-2009, 07:45 AM
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I ran a cheap parts store electric pump on my '88 7.3 IDI pick up - following the advice of the folks at dieselstop.com - if nothing else- it sure made fuel filter changes a hell of a lot less stressfull!

I don't think your problem is the fuel pump however - air is getting into the system some place.
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  #29  
Old 05-04-2009, 08:46 AM
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Quote:
Originally Posted by pawoSD View Post
The leaking air at the lift pump is likely due to a faulty/old primer pump that's venting air. Replace the primer pump with the modern version, and I bet the problems will go away. Lift pumps rarely fail.
I did that...still had the problem. I do have an old style pressure relief valve now, I am going to put that on this week.
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  #30  
Old 05-04-2009, 12:15 PM
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This is supposed to be one of the best.

Facet part #40223
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