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Author Topic:   RACEPUMPS By Stewart
Ego Racing
Dirt Forum Champ
Total posts: 724
posted June 05, 2005 09:05 PM  
How many people have one and who is having problems with them? We cannot get ours to keep pressure when the motor heats up. The car loosoe fuel pressure and trys to die, We installed a Cool can and as long as we can keep ice in it it seems ok. The problem only happens when the caution has been out for a few laps or when idleing in line to go Qualify.

sixwillwin
Dirt Freak

Total posts: 493
posted June 06, 2005 08:26 PM  
I had NUMEROUS problems, first one pumped no fuel whatsoever, they sent me new one and it never would run worth a c r a p after following their advice to the T. Got a refund and put my old system on and all is good again. This was on alky.

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The Joy of Six website

sdhnc29
Dirt Forum Champ
Total posts: 934
posted June 06, 2005 09:39 PM  
So far the one on my car is working perfectly, no problems or issue's. We are not running a bypass system however. So no complaint's here, so far.

Steve

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

artie727
Dirt Full Roller

Total posts: 26
posted June 07, 2005 05:48 AM  
quote:
Originally posted by sdhnc29:
So far the one on my car is working perfectly, no problems or issue's. We are not running a bypass system however. So no complaint's here, so far.

Steve



Steve, I have been interested in this pump since it was introduced but with all the problems people are having with these pumps I have some reservations. I asked Howard for a plumbing diagram with no results. Would you be willing to share with us how you have the race pump plumbed and your fuel pressure numbers.

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Artie Perilloux
A & M Motorsports

Nayr
Dirt Full Roller

Total posts: 34
posted June 07, 2005 08:20 AM  
I am with Steve on this one. I have one on my modified and have had no problems with it. I have the Holley 12-803 regulator on it. I have my fuel pressure set at 8.5 lbs. I don't care for the o-ring they send to seal the pump to the block cause it does not seal after the motor gets warm and oil gets thin. Easily fixed by putting some gasket sealer on it from new. The other thing is that when you are on the track you always have 8.5 lbs of pressure. I find that when you lift going into the corner it askd like it blubbers on occasion. Not every time but sometimes. All in all though I would not hesitate to buy another one.

P.S.
If Hendrens thinks its a good product I would bank on there advice alot more than mine. I have learnt a ton from them on there posts. Thanks Hendrens

sdhnc29
Dirt Forum Champ
Total posts: 934
posted June 07, 2005 10:06 AM  
artie727,

I have mine plumbed pretty similar to what Nayr described. Coming from the fuel cell with -10 line, through ball shut off valve, then through a Peterson fuel filter with stainless screen, and to the pump. From the pump with -8 line to the Holley 12-803 regulator, then to the fuel log. No bypass in the system. I have the pressure regulated down to 6lbs. The fuel pressure is a steady 6lbs at idle or full throttle, with no pressure drop at 8,800rpm. I ran the you know what out of this pump on my chassis dyno before I ever took it to the track. So I have confidence in it. Like most new product's, you will have your problems. Generally you hear more bad stuff than good stuff ;-) I agree 100% with Nayr about the o-ring seal that this pump uses to seal to the block, it's not so good. But like he also said, a little silicone and the problem is solved.

Nayr, If you're on gas you have too much fuel pressure. Gas carb's are designed to run no more than 6-6.5lbs of fuel pressure. So the stumble you mention is most likely due to your high fuel pressure. The 8.5lbs that you are running also tends to make you have to lower the float level at an idle so the engine does not flood with fuel. This can leave you without enough float drop by the end of the straightaway, running the bowl's dry. Once the bowl's are dry, they must fill back up, and if your on the throttle this will also cause a stumble due to lack of fuel. So I would back my fuel pressure back down to 6lbs and readjust my float level. If you're running alky, then you might need a bypass system to get your low RPM fuel pressure back down to 6lbs or below.

Steve

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

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