67 Engine Low Fuel Pump Pressure

aircooled · Posted: Sun Apr 17, 2011 5:45 pm Post subject:

Engine temp 160, fuel pump 98 degrees. Yesterday with the same temps the fuel pressure would go to zero once the engine warmed up. All I need is a warm day which won't happen this week to see if any head way has been made.
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67 Sun Roof / Born Sept 66 / Second Owner
67 Convertible / Born Aug 66 / Second Owner

Member of 67 Posse
Omaha Volkswagen Club
Neb VVWCA Chapter Rep
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andk5591 · Posted: Mon Apr 18, 2011 4:58 am Post subject:

Take a look at where your fuel lines run - anything real close to something hot?
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D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
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aircooled · Posted: Fri Apr 22, 2011 3:09 pm Post subject:

Still no joy. Took the car out for a run today, fuel pressure zero. when I first started it up it had 3 lbs till it warmed up and then started to drop. Came back home hooked up gas can to fuel pump still zero pressure. Three different pumps all do the same thing, is this normal? Bentley calls for 2.8 lbs, is that at start up or normal fuel pressure all the time.
_________________
67 Sun Roof / Born Sept 66 / Second Owner
67 Convertible / Born Aug 66 / Second Owner

Member of 67 Posse
Omaha Volkswagen Club
Neb VVWCA Chapter Rep
Volkswagen Club of Nebraska

badufay · Posted: Mon Oct 17, 2011 9:59 am Post subject:

just saw this thread... not sure if this was ever solved, but i remember reading somewhere that the plastic base can swell slightly restricting the rods motion, thereby not allowing it to move, equaling zero fuel pressure. easy fix is to drill the passage out a hair to allow for swelling of the rod/plastic and excess grease.

Ben
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Current: 1976 VW Bus, 3 spd auto 2.0L FI; 2017 GTI S, 6 spd man; 2017 Jetta SE TSI, 5 spd man; 2006 Golf GL 2.0L, auto
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veedubcrazy · Posted: Mon Oct 17, 2011 11:09 am Post subject:

Good tip. Had'nt thought of that.
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1967 Deluxe Sedan

aircooled · Posted: Mon Oct 17, 2011 4:55 pm Post subject:

Fixed the problem drove the car all summer with no problems. Was nice to be able to go on cruises and not has a problem.
_________________
67 Sun Roof / Born Sept 66 / Second Owner
67 Convertible / Born Aug 66 / Second Owner

Member of 67 Posse
Omaha Volkswagen Club
Neb VVWCA Chapter Rep
Volkswagen Club of Nebraska

Jeckler · Posted: Mon Oct 17, 2011 10:56 pm Post subject:

Don't tell us how, we'll use our imagination.
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Andy
'63 Bug rebuild here.
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rfoster458 · Posted: Fri Dec 16, 2011 11:32 am Post subject:

No but seriously, how did you fix it?

low_67 · Posted: Wed Dec 31, 2014 2:57 pm Post subject:

he said "i solved my problems, so screw you guys; I'm going home". I've had these same issues in my 67 and inquiring minds what to know!

EugeneM

I wanted to share my experience with sanding the pump flange base to raise fuel pressure.

My symptom: intermittent hesitation at highway speeds under load. ’66 Bus, 1600 SP, stock fuel & ignition, generator. At first I troubleshot this as a fuel starvation problem as follows:

Replaced fuel filter - no change in symptom.
Measured fuel pressure = 2.5 PSI at idle, 2.2 PSI at 3800 RPM, no load.
I mistakenly thought this pressure was too low and continued troubleshooting:

Measured pump push rod = 107.65 mm
Measured rod height above flange extended = 10.8 mm
Measured rod height above flange retracted = 6.85 mm
Resultant rod travel = 3.95 mm
Measured flange base thickness (original) =12.7 mm
Measured flange base thickness (spare) = 12.8 mm
Sanded spare flange to 12.6 mm thickness, installed. This resulted in no change in pressure.
Sanded spare flange to 12.3 mm and still no change in pressure, but now a tapping noise was coming from the fuel pump.

Conclusion: Others have reported a rise in pressure after sanding the flange base, but in my case it did nothing but initiate a tapping noise after 0.5 mm was removed.

Continuing troubleshooting:
Replaced flange with original (un-sanded), and installed new Brosol fuel pump using two gaskets. Pressure now measured = 4.7 PSI idle, 4.6 PSI at 3800 RPM, no load.
Added two more gaskets for 4 total (2 upper, 2 lower). Pressure now measured = 4.4 PSI idle, 4.2 PSI at 3800 RPM, no load.

Hesitation at highway speed still there.

My hesitation problem ended up being a loosely mounted condenser. Tightened it and problem went away. Reinstalled original 2.5/2.2 PSI pump (25 year old Brosol with 74,000 miles), and still no hesitation at high speed/RPMs.

andk5591

Don't you hate when that happens....That is when I bring my wife over and she looks over my shoulder and says "shouldn't that wire be connected to something?"
_________________
D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them...


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