How do you adjust the fuel pump pressure?
Moderator: Fatmobile
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- Glow Plug
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How do you adjust the fuel pump pressure?
Is there an exturnal adjustment on the fuel pump of an '86 Golf to turn the fuel pump down? Thanks for any responses and info.
Ephesians 2:8,9
1986 Golf diesel
1986 Golf diesel
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- Diesel Freak
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Re: How do you adjust the fuel pump pressure?
viewtopic.php?f=8&t=5936
Remove the pressure regulator pull the retainer clip, movable plunger and spring, then tap the top tight plunger up a little.
Question is why is your pressure too high, did you try to adjust the pressure?
If not and your pressure is to high you might want to check the "OUT" bolt there is a screen and a small hole one or both may be clogged and could cause high pressure.
Remove the pressure regulator pull the retainer clip, movable plunger and spring, then tap the top tight plunger up a little.
Question is why is your pressure too high, did you try to adjust the pressure?
If not and your pressure is to high you might want to check the "OUT" bolt there is a screen and a small hole one or both may be clogged and could cause high pressure.
Pete
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- Glow Plug
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Re: How do you adjust the fuel pump pressure?
My pressure is not high. I was just wandering, how to cut the fuel back. I thought that maybe if the fuel was cut back a little, the mpg could be improved. Also, in the near future, I am planning on installing a HHO kit, so it would be benificial to me, to know how to cut the fuel back a little.MizPahPAH wrote:viewtopic.php?f=8&t=5936
Remove the pressure regulator pull the retainer clip, movable plunger and spring, then tap the top tight plunger up a little.
Question is why is your pressure too high, did you try to adjust the pressure?
If not and your pressure is to high you might want to check the "OUT" bolt there is a screen and a small hole one or both may be clogged and could cause high pressure.
Ephesians 2:8,9
1986 Golf diesel
1986 Golf diesel
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- Diesel Freak
- Posts: 174
- Joined: Sun May 18, 2008 11:57 pm
- Location: Mizpah South Jersey USA
Re: How do you adjust the fuel pump pressure?
The pump pressure is critical to performance and mpg because of it affect on dynamic timing,
I have read through the Internal pump pressure post many times in my efforts to adjust my jetta for best mpg.
If I try to bring my pressure up to 3bar at Idle I get major marbles mid range rpm.
I can only think I am either missing something or my vane pump is worn and will not build proper pressure at Idle as well as it does at higher rpm.
adjusting the full load screw out will decrease the amount of fuel the control collar allows in to the high pressure head. but this will not equate to lower fuel consumption,
Its a balancing act,
The highest I have gotten is 47mpg in the summer and steady 43 all this past winter
I have read through the Internal pump pressure post many times in my efforts to adjust my jetta for best mpg.
If I try to bring my pressure up to 3bar at Idle I get major marbles mid range rpm.
I can only think I am either missing something or my vane pump is worn and will not build proper pressure at Idle as well as it does at higher rpm.
adjusting the full load screw out will decrease the amount of fuel the control collar allows in to the high pressure head. but this will not equate to lower fuel consumption,
Its a balancing act,
The highest I have gotten is 47mpg in the summer and steady 43 all this past winter
Pete
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- Global Moderator
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Re: How do you adjust the fuel pump pressure?
He might not be asking about internal pump pressure.
Sounds like he thinks the pump pressure determines the amount of fuel injected.
Sounds like he thinks the pump pressure determines the amount of fuel injected.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
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- Turbo Charger
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Re: How do you adjust the fuel pump pressure?
Try turning the max fuel screw near the stop solenoid above the fuel highpressure lines anticlockwise a little... Or apply pressure 2 ft, slower...strokermaverick wrote:My pressure is not high. I was just wandering, how to cut the fuel back. I thought that maybe if the fuel was cut back a little, the mpg could be improved. Also, in the near future, I am planning on installing a HHO kit, so it would be benificial to me, to know how to cut the fuel back a little.MizPahPAH wrote:viewtopic.php?f=8&t=5936
Remove the pressure regulator pull the retainer clip, movable plunger and spring, then tap the top tight plunger up a little.
Question is why is your pressure too high, did you try to adjust the pressure?
If not and your pressure is to high you might want to check the "OUT" bolt there is a screen and a small hole one or both may be clogged and could cause high pressure.
"I'm not here to help... I'm here to Pro-Volke"
Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
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... girls like em ;o)
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That is why if you listen, you will learn:
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7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD )
Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD )
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- Glow Plug
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Re: How do you adjust the fuel pump pressure?
MizPahPAH wrote:The pump pressure is critical to performance and mpg because of it affect on dynamic timing,
I have read through the Internal pump pressure post many times in my efforts to adjust my jetta for best mpg.
If I try to bring my pressure up to 3bar at Idle I get major marbles mid range rpm.
I can only think I am either missing something or my vane pump is worn and will not build proper pressure at Idle as well as it does at higher rpm.
adjusting the full load screw out will decrease the amount of fuel the control collar allows in to the high pressure head. but this will not equate to lower fuel consumption,
Its a balancing act,
The highest I have gotten is 47mpg in the summer and steady 43 all this past winter
I sure don't want to upset the timing of anything. I am probably using the wrong terminology. I guess I am asking if it is possible to use less fuel and still have everything in the correct timming sequence? I am learning about these little diesels from the ground, up. Thanks for your post, by the way.
Ephesians 2:8,9
1986 Golf diesel
1986 Golf diesel
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- Glow Plug
- Posts: 18
- Joined: Thu Apr 21, 2011 3:49 pm
- Location: Swansboro, N.C.
Re: How do you adjust the fuel pump pressure?
Try turning the max fuel screw near the stop solenoid above the fuel highpressure lines anticlockwise a little... Or apply pressure 2 ft, slower...[/quote]
That sounds practicle enough. Thanks.
That sounds practicle enough. Thanks.
Ephesians 2:8,9
1986 Golf diesel
1986 Golf diesel
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- Turbo Charger
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- Joined: Mon Apr 24, 2006 4:34 pm
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Re: How do you adjust the fuel pump pressure?
That sounds practicle enough. Thanks.[/quote]strokermaverick wrote:Try turning the max fuel screw near the stop solenoid above the fuel highpressure lines anticlockwise a little... Or apply pressure 2 ft, slower...
That's OK and the nearest I'll ever get to 'txt speak'
"I'm not here to help... I'm here to Pro-Volke"
Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD )
Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...
Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)
Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.
7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD )