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Author Topic:   RacePumps.com
sdhnc29
Dirt Forum Champ
Total posts: 934
posted April 28, 2005 04:31 PM  
For those who were interested in the "racepumps.com" fuel pump that Howard Stewart makes, I finally dyno and track tested mine. All I can say is thumb's up, great pump, and it did it's job.

We lit the engine off last Tuesday, and we immediately found a fuel leak coming from the bottom of the new fuel pump (where the cap is for the piston). The engine would not hold steady fuel pressure, and it the fuel pressure would drop as the RPM's were raised off of idle. I called Howard Stewart the next day, and he informed me that they had 20 pump's that had a flaw in the piston bore seal and cap (a CNC flaw). So he immediately sent me a second pump. We put the second pump on, and it preformed exactly as advertised. This pump is on a 834hp, 390ci all aluminum SB2.2 head engine in my dirt late model. We are running race gas.

The only thing that I would add to my evaluation, is when you mount your pump. These pumps use only two 3/8" bolt's to mount the pump to the block, as all SB Chevy pump's do. However the pump is shaped to take the place of the plate that usually goes between a standard fuel pump and the block. There is an o-ring to seal the pump. On my aluminum block the new fuel pump happened to leak a very small amount of oil (during racing conditions) out of the bottom of the pump where it meats the block. So this week I simply took the pump off and added a little silicone around the bottom of the pump where it meets the block (outside of the o-ring groove).

Steve

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

Weld IT!!
Dirt Roller

Total posts: 11
posted April 28, 2005 05:26 PM  
We have bought this same pump and installed it on tuesday night. well we 2 had problems the pump did not want to pump. so we called howard and the help we got from him was great we sent it bake and he checked it out. there were some that the piston in the pump would stick and would not pump so he sent us a new 1. we will install the new 1 tonight and hopefully we will race our 1st race on fri. if this system is as good as howards help it should be great!!!
thanks for the tip on the oil leak i will make sure we us silicone!!!!!!!!!!

zeroracing
Dirt Forum Champ
Total posts: 1876
posted April 28, 2005 06:58 PM  
Thank you for posting about a good product, my question is with a gas motor set up, what all parts are needed as far as bypass, etc.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted April 28, 2005 07:48 PM  
zeroracing,

You can use pretty much any diaphragm or pill bypass with this pump. Personally I got rid of the bypass that I was using for the belt drive pump that we had, and simply went to the Holley regulator that Howard Stewart recommended.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

sixwillwin
Dirt Freak

Total posts: 493
posted April 28, 2005 09:49 PM  
Hey Weldit! how did the pump work?

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The Joy of Six website

o5racer
Dirt Freak

Total posts: 402
posted April 28, 2005 09:59 PM  
Just a dumb question. Would there be any noticable power gain from the lower pushrod pressure that they advertise? I would think that it would be an easy thing to check on a dyno.
Nick

Ego Racing
Dirt Forum Champ
Total posts: 724
posted April 29, 2005 09:36 AM  
I also have one on our LM and ended up doing the same thing with the regulator. The BG pill style wouuld only get to 3psi on idle so I made a custom jet and got it to 5psi and we raced it once but decided to swap out the reg for the Holley unit they reccomend and get rid off alll of the bypass line. Ours leaked at the cap also but it only started when we were at the track after a heat race and then stopped when we started it to check another item and it has not leaked again.

happy
Dirt Full Roller

Total posts: 73
posted May 02, 2005 06:47 AM  
What kind of RPM's are you turning with these pumps?

Ego Racing
Dirt Forum Champ
Total posts: 724
posted May 02, 2005 09:21 AM  
We are running a GM crate motor and are turning it about 6800.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted May 02, 2005 04:05 PM  
happy,

8,800rpm on my engine. Put one on a customer's little engine this past week, and he raced it at 9,200rpm this past weekend. No problems. These higher RPM ranges require the light weight fuel pump rod. In fact I'd suggest one for every application.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

GRTWallbanger
Dirt Maniac

Total posts: 196
posted May 08, 2005 10:45 AM  
HMMMMMMMMMMMMMM, Lets me see if i got this right.
sdhnc29 bought one, had problems and sent it back, weld it bought one and had problems.A buddy of mine is on his 2ND pump and 3 regululators, finally went and bought a belt driven pump so he could finally get some racing in(with the belt pump he won the heat and 4th in the feature)up until this night he had 4 DNF's.
AND YOU SAY THIS IS A GREAT PRODUCT.
I guess you guys can figure it out for yourself!!!!!

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted May 08, 2005 03:49 PM  
grt aren't you the one who can't get there fuel pressure right??? I'd listen to the ones giving helpful info before I opened my mouth again.

I guess you guys can figure it out for yourself!!!!!


same applies to you bud

GRTWallbanger
Dirt Maniac

Total posts: 196
posted May 08, 2005 08:11 PM  
This formum is about people helping others.All i meant when i said was you can figure it for yourself was that you can come to your own conclusion on that new pump.
All i was doing was passing on some info that another person was having trouble.I think the track record for the pump speaks for itself.Thanks to this forum my fuel pressure problem will be fixed.

crc1124
Dirt Maniac

Total posts: 143
posted May 08, 2005 09:37 PM  
As with any new product there will be bugs to work out. The problems that have been mentioned on this pump sound minor. From what I have read about this pump I think I'm going to try one out. I have alot of faith in what Steve at Hendren racing engines suggests. I don't personally know him but his posts haven't hurt our team yet.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted May 08, 2005 11:26 PM  
Yes the original intention of this post was to give a honest evaluation of this pump, per a conversation from a previous post regarding this pump. And yes as with any "new" product, there can be some small problems. What makes the difference in my book however, is the fact that the man who owns the company who produces this pump will speak to anyone about it personally. He also stands behind his product. This is a lot more than can be said for most any other manufacturer of anything. So GRTWallbanger is correct in the fact that people can make up their own minds, and purchase or not purchase this particular product. I don't have stock in Stewart Components, so I don't care either way ;-)

I've personally used belt driven fuel pumps for the past 14 year's, and they have for the most part been pretty bullet proof. I must also say that to this point I'm quite please with the Racepump, and have found no disadvantage to running it yet. Unless a guy is looking to get rid of weight (belt drive pump, bypass system, bypass fuel line to the tank, etc.), then I could not endorse making the change from a belt driven pump, as there is no "big advantage" that I have seen in performance. But if your using a stock mount fuel pump, then I would definitely suggest the change in pump's.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
www.hendrensracingengines.com
www.experienceodessa.com

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