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Index > Engine/Drivetrain > Thread: Fuel system prob...
Thread: Fuel system prob...
mazdaspeedgirl


Newbie
Posts: 10
posted October 21, 2002 07:46 PM

Fuel system prob...

Okay, I just got my '74 and am trying to figure out what to do to get him running. He's still at the yard where I bought him because I couldn't drive him home. Here's the scenario:
We tried to get him started, knowing he hasn't been driven in a while. So as I crank it, nothing happens. Greg got a spot of gas and poured it down the carb, cuz I suspect it isn't getting any fuel. That worked, but as soon as he stps feeding the carb, it dies again. We check to make sure fuel is coming into the lines. Weird: when I'm crankin it, fuel dribbles, but stops when he's running. We go thru this for about 10 minutes., but never get him to stay running.

My thoughts: to start with replacing the fuel filter and making sure the fuel lines are okay.

I can't even find the fuel pump/fuel filter/fuel strainer for a '74 at a parts store, but I can order a pump for a '75 (doesn't make sense, unless they are two totally different pumps, which wouldn't make sense either).
I went to the dealer to try to see if they could get the parts, but they couldn't find their catalogs to even lookup parts for "such and OLD truck"....lol...

Questions:

*Has anyone had a similiar experience or have any advice? I have quite a bit of experience working on old carbureted engines, as I have had several classics in the past, but don't know of any frailties this truck/engine may have.

*Is there a good resource for parts for these guys?

Thanks in advance!


____________
Diane
President of the TexasRXs Club Austin,TX
http://www.texasrxs.com
Newest addition to my Mazda collection: 1974 REPU
2001 Mazda MX-5 Miata
2002 Mazda Protege5

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nwaco


Redlining
Posts: 407
posted October 22, 2002 09:13 AM

Sounds like a classic case of a bad/faulty fuel pump or wiring to pump. It is probably dripping during cranking because your drawing a vacuum, and quits when the engine requests too much fuel.

You could take any stand alone electric pump and patch it in to get you home if that is/was the problem. It could be corroded terminals to the pump as well. I would check for power at the pump too. Myself, I would just tow/haul it home, and work on it in a more proper environment. Working on cars at the yard is a PITA.

Good luck, I am working on my "new" 77 REPU too.

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wankel_dreams


Redlining
Posts: 293
posted October 22, 2002 09:33 AM

i ran into a similar problem earlier this year. my fuel pump went bad. It still sounded like it worked, and it just put out a dribble at the carb. what would happen to me is that i could slowly fill the carb up with fuel when the engine was off, but the pump could not keep up when the engine was running. i just got a generic pump that met the flow requirements.
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74 wankel panther
77 REPU
79 rx7
89 Vert

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mazdaspeedgirl


Newbie
Posts: 10
posted October 22, 2002 10:34 AM

quote:
Sounds like a classic case of a bad/faulty fuel pump or wiring to pump. It is probably dripping during cranking because your drawing a vacuum, and quits when the engine requests too much fuel.

You could take any stand alone electric pump and patch it in to get you home if that is/was the problem. It could be corroded terminals to the pump as well. I would check for power at the pump too. Myself, I would just tow/haul it home, and work on it in a more proper environment. Working on cars at the yard is a PITA.

Good luck, I am working on my "new" 77 REPU too.

ah ha...I am gonna have a friend help me trailer him home. You're right, it's easier.
____________
Diane
President of the TexasRXs Club Austin,TX
http://www.texasrxs.com
Newest addition to my Mazda collection: 1974 REPU
2001 Mazda MX-5 Miata
2002 Mazda Protege5

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mazdaspeedgirl


Newbie
Posts: 10
posted October 22, 2002 10:35 AM

quote:
i just got a generic pump that met the flow requirements.

Yep. I may have to do that...

thanks guys! :)
____________
Diane
President of the TexasRXs Club Austin,TX
http://www.texasrxs.com
Newest addition to my Mazda collection: 1974 REPU
2001 Mazda MX-5 Miata
2002 Mazda Protege5

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mazilla


1st Gear
Posts: 44
posted November 27, 2002 12:14 PM

girl, don't even buy a facet type pump. the square ones...although in the day we would use 2 together, I thnk they really junk...more importantly, get a regulator(holley) that will regulate the fuel better and replace the pump with a carter...then you can put three filters here and there and the fuel probs should not show up for a long time. If you like to pound on the truck then I would go that way because your going to have to switch to a carter type pump to get any real gas in the engine at high rpm...those square ones just can't hang...and the stock carb really only needs 3psi but for sustained bursts, those squares are out...wait till you put the weber on it:)

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ROTARY POWER!!! V8 is a great juice for consumption.

       
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