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New fuel pump
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kreemoweet
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PostPosted: Mon Jun 05, 2023 8:35 pm    Post subject: Re: New fuel pump Reply with quote

There's nothing preventing anyone from installing a "generator-style" pump on a car equipped with an alternator.
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Cusser
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PostPosted: Mon Jun 05, 2023 8:54 pm    Post subject: Re: New fuel pump Reply with quote

kreemoweet wrote:
There's nothing preventing anyone from installing a "generator-style" pump on a car equipped with an alternator.

Correct, just tougher to remove a non-slanted FP with an alternator.

You match the pushrod length to whether the flange on the fuel pump is recessed or not; recessed takes 108mm, non-recessed takes 100mm. That typically means a non-slanted FP takes 108mm, and the slanted type 100mm.

So one should not put too much credence in whether one is called alternator type or generator type. And "alternator type" FP with appropriate pushrod works just fine on a generator-equipped VW.
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74volks
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PostPosted: Tue Jun 06, 2023 5:48 am    Post subject: Re: New fuel pump Reply with quote

Cusser wrote:
74volks wrote:
So I removed the fuel pump and the push rod. But for some reason I can't get the spacer to come out. Any advice?

Leave the spacer in place, they often break when folks try to remove them, leaving a piece stuck in the case.

There are threads on how to remove the broken-off piece.


This is the reason I was trying to remove it.......

As stated by ashman40......<<Additionally, you may want to make sure your fuel pump stand/spacer is not cracked. If it is, now is the time to replace it. Make sure it slides loosely into the case opening. If the fit is snug you should sand down the outer diameter of the snout that slides into the case. As the case heats up it can compress the pump stand snout and end up binding the pump push rod.>>
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74volks
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PostPosted: Tue Jun 06, 2023 5:53 am    Post subject: Re: New fuel pump Reply with quote

kreemoweet wrote:
There's nothing preventing anyone from installing a "generator-style" pump on a car equipped with an alternator.


Good to know.


Cusser wrote:
Correct, just tougher to remove a non-slanted FP with an alternator.

You match the pushrod length to whether the flange on the fuel pump is recessed or not; recessed takes 108mm, non-recessed takes 100mm. That typically means a non-slanted FP takes 108mm, and the slanted type 100mm.

So one should not put too much credence in whether one is called alternator type or generator type. And "alternator type" FP with appropriate pushrod works just fine on a generator-equipped VW.


So just to be sure.....based on the photos I posted, I have an alternator instead of a generator on my car, correct?

Is it true what someone posted earlier.....that the new pushrods are not that great of quality?
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Cusser
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PostPosted: Tue Jun 06, 2023 6:14 am    Post subject: Re: New fuel pump Reply with quote

74volks wrote:
So just to be sure.....based on the photos I posted, I have an alternator instead of a generator on my car, correct?


Yes, yours has alternator - an externally-regulated unit.
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PWB
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PostPosted: Tue Jun 06, 2023 1:01 pm    Post subject: Re: New fuel pump Reply with quote

74volks wrote:
Greetings......

If I am going to replace the fuel pump on my 74 beetle, what else besides the fuel pump do I need to go along with it?

From the little bit of research I have done, I need to get a fuel pump that goes with an alternator as opposed to a generator. Is this correct?

OK so editing to add.....

Looked around on wolfsburg west site. Looks like I might need a couple of gaskets. How do I know if I need a new pushrod?


74volks,
Once your new pump is installed, make sure to check the output fuel pressure with a test gauge. Should not exceed ~2.5-3psi. Any more, and you'll need to grind down the push rod a bit until it's correct.
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PostPosted: Tue Jun 06, 2023 8:14 pm    Post subject: Re: New fuel pump Reply with quote

The German Pierburg dome top or square top will fit an engine with an alternator. I've sold lots to folks with alternators and no one had an issue.

The pushrod on these two pumps I mention is ^108mm. The more important measurement is how much the pushrod sticks up above the fuel pump stand. It should be 13mm. Folks need to always measure how much it sticks up as there are different thickness pump stands. Folks could have also removed material making it thinner in the past.


Image may have been reduced in size. Click image to view fullscreen.


This picture shows how to measure it.


Image may have been reduced in size. Click image to view fullscreen.


No matter what pump you purchase, it's always a good thing to T in a fuel pressure gauge to measure the fuel pressure. Ideally you want between 2.5 to 3 psi. If your pressure is say 3.5, you can add a couple of gaskets between the pump and the stand to lower it down .5 lbs. I don't like to add more than 2 gaskets as you can lower the volume as well.
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74volks
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PostPosted: Wed Jun 21, 2023 1:32 pm    Post subject: Re: New fuel pump Reply with quote

PWB wrote:

74volks,
Once your new pump is installed, make sure to check the output fuel pressure with a test gauge. Should not exceed ~2.5-3psi. Any more, and you'll need to grind down the push rod a bit until it's correct.



wcfvw69 wrote:

No matter what pump you purchase, it's always a good thing to T in a fuel pressure gauge to measure the fuel pressure. Ideally you want between 2.5 to 3 psi. If your pressure is say 3.5, you can add a couple of gaskets between the pump and the stand to lower it down .5 lbs. I don't like to add more than 2 gaskets as you can lower the volume as well.


With that being said, can anyone recommend a good pressure gauge? I don't want top of the line but I don't want harbor freight quality either! Shocked
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PostPosted: Wed Jun 21, 2023 2:04 pm    Post subject: Re: New fuel pump Reply with quote

74volks wrote:
PWB wrote:

74volks,
Once your new pump is installed, make sure to check the output fuel pressure with a test gauge. Should not exceed ~2.5-3psi. Any more, and you'll need to grind down the push rod a bit until it's correct.



wcfvw69 wrote:

No matter what pump you purchase, it's always a good thing to T in a fuel pressure gauge to measure the fuel pressure. Ideally you want between 2.5 to 3 psi. If your pressure is say 3.5, you can add a couple of gaskets between the pump and the stand to lower it down .5 lbs. I don't like to add more than 2 gaskets as you can lower the volume as well.


With that being said, can anyone recommend a good pressure gauge? I don't want top of the line but I don't want harbor freight quality either! Shocked


This will work nicely- https://www.amazon.com/OTC-5613-Vacuum-Pressure-Gauge/dp/B0050SG9KW
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74volks
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PostPosted: Wed Jun 21, 2023 5:16 pm    Post subject: Re: New fuel pump Reply with quote

wcfvw69 wrote:
This will work nicely- https://www.amazon.com/OTC-5613-Vacuum-Pressure-Gauge/dp/B0050SG9KW


Thanks. I'm pretty sure my husband has one of those. I don't know if they are all vacuum and pressure combined. I know for sure his does vacuum. I'll have to check with him.
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PostPosted: Thu Jun 22, 2023 12:27 am    Post subject: Re: New fuel pump Reply with quote

You just need to check the range of pressures the gauge will measure. Gauges meant for carbs measure pressures around 10psi. Gauges meant for fuel injection will measure 30psi+ and would be terrible for accurately measuring low pressure applications.

Though, all the combo vacuum+pressure gauges I have seen are for carb pressures.
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PostPosted: Thu Jun 22, 2023 4:06 pm    Post subject: Re: New fuel pump Reply with quote

You should always use a gauge that registers about half way up the scale of what your intended measurement is going to be. Measurements at either end of the scale are usually not accurate.

So yes for a 3.5 psi fuel pressure you can get away with a say 10 psi gauge.

I always chuckle when I see people fitting an oil temperature or pressure gauge on a VW when their "normal" operating figure is almost at the bottom stop of the gauge.
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PostPosted: Thu Jun 22, 2023 4:20 pm    Post subject: Re: New fuel pump Reply with quote

74volks wrote:


With that being said, can anyone recommend a good pressure gauge? I don't want top of the line but I don't want harbor freight quality either! Shocked


What's wrong with a harbor freight fuel pressure gauge?
They work perfectly fine

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PostPosted: Thu Jun 22, 2023 5:30 pm    Post subject: Re: New fuel pump Reply with quote

sb001 wrote:
74volks wrote:


With that being said, can anyone recommend a good pressure gauge? I don't want top of the line but I don't want harbor freight quality either! Shocked


What's wrong with a harbor freight fuel pressure gauge?
They work perfectly fine


I also have the same HF fuel pressure gauge. The only issue I saw was that the plastic tee was weak, so I bought a stronger one at Ace Hardware.
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