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Author Topic:   fuel pump problems
allautopaul
Dirt Roller

Total posts: 6
posted May 02, 2003 08:41 PM  
Hi how ya doing locals. new here. Central California. Got a carbureted 360 class alcohol car. racing last Saturday night it started blowing oil out of the fuel pump weep hole. Now I've seen fuel come out of these weep holes but never oil. I am being told that they are sealed from the crankcase, the seal is gone and I need a new pump. I was thinking the G forces from left turns was filling up the cavity pumping the oil out the weep hole. Question 1. is the weep hole sealed from the crankcase and this mystery seal I don't know about is blown out? 2. If it is, and I need a new pump, what is a decent one? Bought this one at the track last season and its only got about 4 races on it. this is the third pump in a season in a half. I would buy a kit for it, but don't know what make it is and no one can tell me. Thanks, Paul.

mod4
Dirt Freak

Total posts: 223
posted May 03, 2003 01:08 PM  
I run both Mods with pumps like yours and 360 Sprints with injector pumps.

I had several Alky pumps die on me(oil out the weep hole just like you said), they all had a common link, they sat for awhile. I did three things, switched to the Edelbrock 12# Alky pump, began always running top lube, and never let the motor sit more then 4 or 5 days without running it.
Fuel system problems have been 0% for season and almost a 1/2 now.
Best Wishes.

allautopaul
Dirt Roller

Total posts: 6
posted May 03, 2003 08:16 PM  
I had a feeling other people had this problem and would respond! thanks a lot for the info, I was looking at that pump, but so many pumps a person just don't know what to buy.

one more thing, what is top lube? thanks, Paul

quote:
Originally posted by mod4:
I run both Mods with pumps like yours and 360 Sprints with injector pumps.

I had several Alky pumps die on me(oil out the weep hole just like you said), they all had a common link, they sat for awhile. I did three things, switched to the Edelbrock 12# Alky pump, began always running top lube, and never let the motor sit more then 4 or 5 days without running it.
Fuel system problems have been 0% for season and almost a 1/2 now.
Best Wishes.



mod4
Dirt Freak

Total posts: 223
posted May 04, 2003 09:32 AM  
Top Lube is made by several different companies, it's a fuel additive for alcohol that helps "lube" everything, alky is so dry & hard on parts that it's worth doing. People use lots of different stuff including Marvel Mystery Oil, I am a believer in buying dedicated top lube. I think right now I am using Pro Blend, but I will look when I go to the shop later.

allautopaul
Dirt Roller

Total posts: 6
posted May 17, 2003 10:48 AM  
went racing last weekend and another pump started blowing oil out. took apart the old one, the seal falls out of the top of the pump, lets oil in and the diapragm now pushes it out the fuel release hole.

solved the problem, bought a hilborn "0" pump used and will plumb it this week.

allautopaul
Dirt Roller

Total posts: 6
posted June 10, 2003 12:50 AM  
Well the Hilborn cam driven pump works great. don't have to worry about no more seals or pumps going out, I have re-jetted the car at the same time, since the first post we won one main event, got 3rd in another and the rest have been top 5 finishes. so all is going well for now. Hilborn was real good about helping me set it up and set me up with a bypass valve. The driver complains about blubbering halfway thru the turn but it did that with the old pump too. So he can live with it for now, but I will try to figure that out.

Dean
Dirt Newbie

Total posts: 2
posted June 11, 2003 04:58 PM  
We currently use no additives in our methanol. Every week, back at the shop after the race, we remove the fuel pump from the car. We are in our 5th week of racing and this routine has caused us problems for the last 2 weeks. Both times an error has been made by one of the crewmembers while installing the pump, costing us our hotlaps and making it difficult to figure our heat setup. I realize the easiest solution would be to make sure it's done right the first time, but I'm wondering if this Top lube stuff would eliminate the need to remove the pump altogether. Unfortunately, I can't tell you exactly what brand and model pump it is. Our first year, we never messed with the pump. Our second year, we had to replace it. Our driver/car owner (who has the most knowledge regarding sprint cars) insists we do this to save wear on the pump. I'm just wondering if, by using a lubricating additive, we can leave the pump on throughout the week, and save the risk of errors, while not causing damage to the pump.

Any info is greatly appreciated, thanks.

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