Currently running a fvp, which is just a gmb, and it works great.
Graf here. 15k miles/ 2 years, no problems.
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.
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.
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.
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.
I've also had a Graf I think it was, it did have a metal impeller, which started leaking after 7 yrs.
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
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
Have had bad luck with graf metal impeller pumps, multiple failures over 2 different cars.
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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:
In March 2026 on PartReview, water pump GRAF were overall better than GMB.
In March 2026 on PartReview, water pump GRAF were overall more popular than GMB.
By vote balance, water pump GRAF surpassed GMB:
By number of reviews, water pump GRAF surpassed 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.
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.
