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Author Topic:   Pumps
Gary
Gearhead

Posts: 726
From: Sarasota, Fla. USA
Registered: Jun 99

posted 12-16-2001 08:41 AM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
Who makes an elec.pump that doesn't require gravity to feed the fuelpump? Maybe I need one that both pulls fuel and pushes. An idea but the way mine is now it should work with the fuel level in tank at least 6-8" higher than the pump.

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kid vishus
Gearhead

Posts: 6098
From: middle of NC
Registered: Oct 2000

posted 12-16-2001 09:04 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I dont know Gary. I have been reading every installation on your problem, hoping I could come up with an answer for you. Most (if not all) electric fuel pumps are pushers, not pullers. I have my pump mounted level with my outlets and actaully in front of them, and have never had any problems. So I wouldnt think that one inch higher would cause all the greif you have experianced. When I bought my car, it had one blue pump, several 90* fittings, and not the good tube style either, and it ran low 11's without any problem.

Sorry
you have me stumped.

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F551
Gearhead

Posts: 245
From: Manitoba, Canada
Registered: Nov 2000

posted 12-16-2001 09:10 AM     Click Here to See the Profile for F551   Click Here to Email F551     Edit/Delete Message   Reply w/Quote
HI Gary - been following your dilemma.

The first thing that hit me from your pics was the exhaust. How tolerant are your neighbors? Could you run the car with the exhaust dropped at the headers?

This would remove the heat issue - wonder if you're not boiling the fuel in that nice filter - filter feeds the pump right? If the gasoline is vaporizing going into the pump the pump will sound like it's starving and you will loose pressure.

Fact that everything is Ok until the car warms up .....

Good Luck!

------------------
Fred
68 Mustang 500CID/Powerglide - "No Tubs"
86 Mustang GT Cobra

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Gary
Gearhead

Posts: 726
From: Sarasota, Fla. USA
Registered: Jun 99

posted 12-16-2001 10:39 AM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
F551, system will do the exact same thing with engine stone cold. Wheather the engine is running or not the problem occurs in the same time frame. When the engine has been run awhile and good and hot Iv'e felt the lines and filter unit for excess heat---all is still nice and cool to slightly warm to the touch. Not the problem...but I wish that was all it was.

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Gary
Gearhead

Posts: 726
From: Sarasota, Fla. USA
Registered: Jun 99

posted 12-16-2001 10:50 AM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
Guys, if I just turn the pump ON engine off and left to run, in a few mins. the pump starts to plusate and can be seen it at the gauge. If left to continue the pressure will slowly drop---freakin weird!! Then when the pump is turned off you can instantly see air bubbles coming back into the tank fitting from the pump. I can veiw this now as Iv'e removed the foam and can see whats happening through the filler cap on the tank. Could it be possible for air to run back to the pump if there was a leak/vent from a line on the fuel log? I woul;d think it would just vent torwards the carbs and out the vents. Can't see how air can run backwards when the pump is ON, especailly up and down the lines all the way back to the tank---im stumpped or totally stupid....JEZZZ
Iv'e even removed all the fitting on all the lines to check if when going together the rubber had twisted when tightening, all fittings looked great and seated well., after doing all that I then pressure tested them with vac. pump I use in my wood shop for a vac. press. I pulled the lines down to 25"'s and left them awhile and the gauge stayed right at 25"'s for over 15 mins.
This is driving me nutz-o

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kid vishus
Gearhead

Posts: 6098
From: middle of NC
Registered: Oct 2000

posted 12-16-2001 11:13 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
The pump pulsates with the motor off becouse it is deadheaded. That is common. Mine used to do something like that till I got a return style pump. Except mine, with the pump running and the motor off, would eventually build up pressure till it pushed past the needle and seat. I would be suspect of your fuel log. If it were mine, I would find a way to change that or even eliminate it (just for testing purposes). It seems like you have covered every other possibility except for the log itself. (unless I missed that part)

The only thing I would have done different after viewing your pics, is I would have ran the line straight across from the regulator to the log, without the dip in it. But that shouldnt make it have that problem.

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Hans olsson
Gearhead

Posts: 622
From: Sweden
Registered: Apr 2000

posted 12-16-2001 12:33 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
Gary, have you tried to run two lines from the regulator directly to each carb and bypassing the fuel log completly? Maybe the regulator blocks the outlet randomly when only one outlet is used? Another idea ,remove the regulator and lower the bypass spring pressure in the pump just to check the regulator. Just guessing. Hans Olsson

------------------

  • 71 Mach1 351c
  • E/SA 11.89-110
  • F/SA 11.92-110

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Hans olsson
Gearhead

Posts: 622
From: Sweden
Registered: Apr 2000

posted 12-16-2001 12:51 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
Come to think of one more thing, can you check the pressure before the regulator?

------------------

  • 71 Mach1 351c
  • E/SA 11.89-110
  • F/SA 11.92-110

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