Water pump GRAF or GMB

PartReview Score

Rank #2 in ranking

3.5

Leaks

3.0

Noise

3.6

Overheating

4.2

Owners' choice:

PR Score

Ranking

Votes

Reviews

Average rating

Properties

Car

PartReview Score

Rank #6 in ranking

4.2

Leaks

4.1

Noise

3.7

Overheating

4.0

No data

Reviews

All

GRAF

GMB

GMB › Water pump

Living_Guidance_4120 22 Dec 2025, 04:56

Leaks:
Noise:
Overheating:

Rating 5.0

Currently running a fvp, which is just a gmb, and it works great.

Pros: works great

GRAF › Water pump

Electronic_Nail_7433 4 Dec 2025, 02:21

Leaks:
Noise:
Overheating:

Rating 4.0

Graf here. 15k miles/ 2 years, no problems.

Pros: no problems

Mileage: 24140 km

GRAF › Water pump

Eric D 28 Nov 2025, 05:40

Overheating:

Rating 5.0

I use on my 12v and 24v VR6 engines, Eurowise aluminum thermostat housing and 42DD stainless steel crack pipe. Water pump I use GRAF or Hepu for its metal impeller.

Pros: metal impeller

GMB › Water pump

EksCelle 25 Nov 2025, 07:58

Leaks:

Rating 5.0

I've been running the aluminum GMB pump (1301280AL on Rockauto) on the 455 in my '72 Bonneville for about 5 years now with no problems.

Pros: no problems, 5 years reliable

Part number: 1301280AL

GMB › Water pump

DaHozer 21 Nov 2025, 00:16

Leaks:

Rating 4.5

I have 20-25k miles on a GMB pump now and it hasn't leaked a drop. We'll see how long it goes, but so far I'm happy with it.

Pros: no leaks, reliable performance

Mileage: 32000 km

GRAF › Water pump

Dry-Satisfaction-633 5 Oct 2025, 15:25

Leaks:

Rating 4.5

If it *is* leaking you might want to consider replacing it with a Graf alloy-bodied pump which won’t be affected by heat and exposure to oil, the usual causes of eventual failure of the plastic pumps.

Pros: not affected by heat, resistant to oil

Vehicle: Volkswagen Scirocco

GRAF › Water pump

BMWMikeM 4 Dec 2025, 03:55

Leaks:

Rating 3.0

I've also had a Graf I think it was, it did have a metal impeller, which started leaking after 7 yrs.

Pros: metal impeller

Cons: started leaking after 7 years

GRAF › Water pump

rns96 16 Dec 2025, 03:36

Leaks:

Rating 1.0

what I had problems with is with Graf water pump, that was included as part of FCP euro cooling system kit, water pump seal around the bearing started pouring coolant like a waterfall after only 11k miles, I replaced it with a Stewart pump

Cons: seal started pouring coolant

Mileage: 11000 km

GRAF › Water pump

godoftopo12 27 Jun 2025, 14:05

Leaks:

Rating 1.0

the metal fins are spot welded like shit on these cheap metal waterpumps. my graf pump also started to leak from the weep hole after a year too

Cons: poor spot welds, leaked after year

GRAF › Water pump

sparksparkyboomboom 14 Mar 2025, 00:15

Leaks:

Rating 1.0

Have had bad luck with graf metal impeller pumps, multiple failures over 2 different cars.

Cons: bad luck, multiple failures

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Show all

Which water pump to choose — GRAF or GMB?

If choosing water pump across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.

We compare water pump across these categories:

PR Score.
Overall ranking.
Vote balance.
Average rating.
Number of reviews.
Feature ratings.
Car owners’ choice.

Which water pump are better — GMB or GRAF?

In March 2026 on PartReview, water pump GRAF were overall better than GMB.

GRAF received a PR Score of 70 out of 100, and GMB scored 85 points.
GRAF ranked 2 in the overall ranking, and GMB ranked 6.
The average rating is higher for GMB (4.2) than for GRAF (3.5).
Water pump GMB have better feature ratings than GRAF:
- Leaks - owners believe, that this property for GMB is better than GRAF.
- Overheating - drivers claim, that this property for GRAF is outperforms GMB.
- Noise - reviews suggest, that this property for GMB is preferred to GRAF.

Which water pump are more popular — GRAF or GMB?

In March 2026 on PartReview, water pump GRAF were overall more popular than GMB.

By vote balance, water pump GRAF surpassed GMB:

For GRAF, the ratio of positive (146) to negative (62) votes is 84 votes.
For GMB, the ratio of positive (40) to negative (7) votes is 33 votes.

By number of reviews, water pump GRAF surpassed GMB:

For water pump GRAF there are 68 reviews: 46 positive, 4 neutral, 18 negative.
For water pump GMB there are 15 reviews: 12 positive, 2 neutral, 1 negative.

Which water pump do car owners prefer — GRAF or GMB?

In March 2026, according to PartReview, water pump GRAF led more car-specific ratings than GMB:

GRAF are chosen by owners of cars such as: Volkswagen Jetta, Volkswagen Tiguan, and others.

Water pump GMB have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.

Other comparisons of water pump

If this comparison didn’t fully answer your question, there are many others on PartReview.

For example, comparisons of water pump GRAF with: OEM Volkswagen, OEM Audi, AISIN, Gates, Hepu, Pierburg, OEM FORD, OEM BMW, OEM Toyota, Saleri.

Also available: comparisons of water pump GMB with: OEM Volkswagen, OEM Audi, AISIN, Gates, Hepu, Pierburg, OEM FORD, OEM BMW, OEM Toyota, Saleri.

You can also see who is better among other water pump manufacturers: OEM Audi or OEM Volkswagen, GRAF or OEM Volkswagen, AISIN or OEM Volkswagen, Gates or OEM Volkswagen, Hepu or OEM Volkswagen.