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  #1  
Old 01-08-2010, 04:50 PM
aussie01 aussie01 is offline
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Default 7.3l Powerstroke - fuel pump problems

recently I noticed my 97 F350 PSD having a slight loss of power, but only intermittently and only when running on diesel, but the other day it started running real bad on VO as well and even worse on diesel. I managed to limp my way home on VO and now I can't even get the truck started. I have a Frybrid kit and it is installed as per the Frybrid instructions with the stock filter and pump modifications. The stock pump handles both the VO and the diesel. My suspicion is the stock pump has died, but there was no leaking from the weep hole like my last pump I replaced did. I don't have a suitable vacuum gauge to see if the pump is sucking the fuel correctly, but when I remove the fuel return line from the solenoid and crank the engine, the return is bone dry, nothing at all comes out, so my guess is the pump is now an ex-pump.
So my first question is, if the fuel pump was working, then there should be fuel in the return lines as well and if not, can I assume that the pump has died?
And second, can I re-plumb the fuel pump and lines so the stock pump is pumping the fuel as originally designed to do, keep the feed solenoid after the diesel filter and add a secondary pump(Fass?) to deliver the VO to the solenoid. Both fuels would then go through the high pressure side of the stock pump.
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1997 F350 with Frybrid conversion - now sold (sniffle)
http://web.mac.com/stephvdw/iWeb/Sit...20Frybrid.html

1995 Peugeot 405 SRDT Wagon
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  #2  
Old 01-08-2010, 06:26 PM
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cgoodwin cgoodwin is offline
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That pump should last many years on VO, my neighbor drives one every day on Vo and has been since 2005 with no issues. since the low pressure side of the pump is not plumbed into the high pressure side, pull this line and see if fuel squirts out. If not then I would think the pump to be bad...
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  #3  
Old 01-09-2010, 02:04 PM
aussie01 aussie01 is offline
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So I bought a cheapy Harbor Freight fuel injection test kit and I've hooked up the pressure gauge with a "T" fitting between the output of the low pressure side of the pump and the high pressure side input. I can start up and it seams to idle ok, but still has power issues when test driving, the HF test gauge reads under 10 PSI. I know the pressure when measured at the schrader valve would normally be 45-75 psi. Is the pressure at the schrader valve made by the low pressure side of the fuel pump? I don't know if the HF gauge is a POS, could I really only have <10 PSI and the problem be my 1 year old fuel pump? Right now I have bypassed the feed solenoid completely and it runs a bit better, when I run the fuel through the solenoid it is much worse, either way though it's no good.
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1997 F350 with Frybrid conversion - now sold (sniffle)
http://web.mac.com/stephvdw/iWeb/Sit...20Frybrid.html

1995 Peugeot 405 SRDT Wagon
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  #4  
Old 01-11-2010, 05:15 PM
aussie01 aussie01 is offline
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so turns out the side of the pump that was pushing 6-8 lbs pressure should be 40-50 lbs. So out with the old pump and in with a new and problem solved. So the 13 month old pump was not pushing enough pressure anymore. I hope I'm not replacing my pump every year or 20,000 miles!!
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1997 F350 with Frybrid conversion - now sold (sniffle)
http://web.mac.com/stephvdw/iWeb/Sit...20Frybrid.html

1995 Peugeot 405 SRDT Wagon
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  #5  
Old 01-12-2010, 04:05 AM
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kirkharrod kirkharrod is offline
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The stock pump is on ebay for $99.95.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT
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2002 Ford F-250 7.3L Greasecar 2nd gen Powerstroke conversion; 20 plate FPHE, AIH Delete, Cooling Mist water injection, auxiliary coolant filter, auxiliary coolant pump, Aeroforce ScanGauge 2, ISSPro EGT, Tranny temp and Boost gauges, ISSPro Performax fuel pressure gauge, Cyberdyne digital temp gauge, ambient air gauge, 280,000 miles, the last 80,000 on grease. No vegetable oil related problems yet!
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Old 01-12-2010, 06:46 AM
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cgoodwin cgoodwin is offline
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are you buying aftermarket chinese pumps???
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  #7  
Old 01-12-2010, 04:44 PM
aussie01 aussie01 is offline
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whatever the pump is that Kragen sold me for $100. The receipt says Airtex, stamped on the pump it says Carter.
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1997 F350 with Frybrid conversion - now sold (sniffle)
http://web.mac.com/stephvdw/iWeb/Sit...20Frybrid.html

1995 Peugeot 405 SRDT Wagon
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  #8  
Old 01-13-2010, 04:54 PM
aussie01 aussie01 is offline
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Angry

Quote:
Originally Posted by kirkharrod View Post
The stock pump is on ebay for $99.95.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT
wrong pump.
Mine is this http://www.kragen.com/ProductDetail....ype=52&PTSet=A

anyway, it's been in 3 days and i think it's LEAKING!!!!!!!! AAARRRGGGHHHHH!!!!
The leak is both diesel and WVO, there is only one hose that runs both fuels, from the solenoid to the pump. I gave all the clamps and extra tweaking but i'm pretty sure it's leaking from the weep hole.
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1997 F350 with Frybrid conversion - now sold (sniffle)
http://web.mac.com/stephvdw/iWeb/Sit...20Frybrid.html

1995 Peugeot 405 SRDT Wagon
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  #9  
Old 01-14-2010, 04:20 AM
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kirkharrod kirkharrod is offline
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Quote:
Originally Posted by aussie01 View Post
wrong pump.
Mine is this http://www.kragen.com/ProductDetail....ype=52&PTSet=A

anyway, it's been in 3 days and i think it's LEAKING!!!!!!!! AAARRRGGGHHHHH!!!!
The leak is both diesel and WVO, there is only one hose that runs both fuels, from the solenoid to the pump. I gave all the clamps and extra tweaking but i'm pretty sure it's leaking from the weep hole.
The stock pump that is in mine is the Bosch 0580464074 (linked above). It has worked great for pumping wvo.
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2002 Ford F-250 7.3L Greasecar 2nd gen Powerstroke conversion; 20 plate FPHE, AIH Delete, Cooling Mist water injection, auxiliary coolant filter, auxiliary coolant pump, Aeroforce ScanGauge 2, ISSPro EGT, Tranny temp and Boost gauges, ISSPro Performax fuel pressure gauge, Cyberdyne digital temp gauge, ambient air gauge, 280,000 miles, the last 80,000 on grease. No vegetable oil related problems yet!
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  #10  
Old 01-14-2010, 04:21 AM
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kirkharrod kirkharrod is offline
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Aaah, I just read your post and I see '97. My bad. I should really read better.
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2002 Ford F-250 7.3L Greasecar 2nd gen Powerstroke conversion; 20 plate FPHE, AIH Delete, Cooling Mist water injection, auxiliary coolant filter, auxiliary coolant pump, Aeroforce ScanGauge 2, ISSPro EGT, Tranny temp and Boost gauges, ISSPro Performax fuel pressure gauge, Cyberdyne digital temp gauge, ambient air gauge, 280,000 miles, the last 80,000 on grease. No vegetable oil related problems yet!
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