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Symptoms of a bad fuel pump?

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Old 03-26-2008, 01:35 PM   #1
adr3naline
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Default Symptoms of a bad fuel pump?

What would be the symptoms of a bad fuel pump?
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Old 03-26-2008, 01:41 PM   #2
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Default RE: Symptoms of a bad fuel pump?

No gas to carb..........they will just fail.
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Old 03-26-2008, 01:54 PM   #3
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Default RE: Symptoms of a bad fuel pump?

I am guessing you are trying to address the earlier problems you have been having with your car? When was the last time the fuel filter was changed? Also, it could be too much fuel caused by a bad needle and seat or floats in the carb. I almost bought that car......glad I didn't.
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Old 03-26-2008, 02:02 PM   #4
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Default RE: Symptoms of a bad fuel pump?

Yeah, still trying to figure it out... I haven't had the problem happen again. I've tried to make it happen again in front of my house, but it seems it only wants to ruin my life when I'm far away from home.

When I start it up in the morning, it struggles to keep running for the first few minutes. I'm sure some people on this forum will just tell me to deal with it, since its a 40 year old car...

I took of my fuel filter to check it out... a bunch of brown/red crap came out (on the input end), and it was clean on the output... I'm hoping my tank isn't rusty, it's solid on the outside - top and bottom. I'll replace my filter tonight.

How's yours running?
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Old 03-26-2008, 03:00 PM   #5
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Default RE: Symptoms of a bad fuel pump?

Several actually:
They leak from the diaphram externally and internally (not good-it goes into the crankcase)
They don't produce enough volume.
They don't produce enough pressure.
Rarely will they produce too much pressure.

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Old 03-26-2008, 03:36 PM   #6
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Default RE: Symptoms of a bad fuel pump?


Quote:
ORIGINAL: ririe44

Yeah, still trying to figure it out... I haven't had the problem happen again.┬* I've tried to make it happen again in front of my house, but it seems it only wants to ruin my life when I'm far away from home.┬*

When I start it up in the morning, it struggles to keep running for the first few minutes.┬* I'm sure some people on this forum will just tell me to deal with it, since its a 40 year old car...

I took of my fuel filter to check it out... a bunch of brown/red crap came out (on the input end), and it was clean on the output... I'm hoping my tank isn't rusty, it's solid on the outside - top and bottom.┬* I'll replace my filter tonight.

How's yours running?

I have had the same problem. Is your choke adjusted? What about your air/fuel mixture? Points gap set correctly?

Just a few things to think about that have been suggested to me or I have done to help the problem.
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Old 03-26-2008, 10:34 PM   #7
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Default RE: Symptoms of a bad fuel pump?

Quote:
ORIGINAL: ririe44
...

I took of my fuel filter to check it out... a bunch of brown/red crap came out (on the input end), and it was clean on the output... I'm hoping my tank isn't rusty, it's solid on the outside - top and bottom. I'll replace my filter tonight.

How's yours running?
Had probs with mine and rusty tank...did your fuel filter look like this? If so, might be rust getting into the carb and all those little inlet holes causing probs...



[IMG]local://upfiles/19071/2F42055E725E4C688433C09FE0941A80.jpg[/IMG]
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Old 03-26-2008, 10:39 PM   #8
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Default RE: Symptoms of a bad fuel pump?

this is kinda related, but sorry for slight change of subject. anyone know of a good rebuid kit for these kind of fuel pumps?
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Old 03-26-2008, 10:42 PM   #9
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Default RE: Symptoms of a bad fuel pump?

Don't rebuild them you just replace them. they are cheap.
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Old 03-27-2008, 12:27 AM   #10
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Default RE: Symptoms of a bad fuel pump?

My fuel pump stared to lose volume when it was going bad. It would produce 6psi no problem. At full power accelerations from 1st gear it would run great but pressure would be about 2psi before the shift into 2nd gear. as soon as you hit 2nd gear the fuel pressure would drop to 0 and about 3 seconds later the car would lose power and would produce only about 25% of its rated Hp. As long as you kept your foot into it would continue to run like crap. You would have to back off the gas for about 5 to 7 seconds before the system would recharge with fuel giving you about another 10 seconds worth of WOT before it would do the same crap again.

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Old 03-27-2008, 01:00 AM   #11
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Default RE: Symptoms of a bad fuel pump?

^haha, "my cars fast..but only in ten seconds at a time!" thats a great excuse!
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Old 03-27-2008, 01:09 AM   #12
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Default RE: Symptoms of a bad fuel pump?

haha, nothing a nice carter fuel pump cant solve
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Old 03-28-2008, 01:55 PM   #13
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Default RE: Symptoms of a bad fuel pump?

Any luck with your problemRirie?
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Old 03-31-2008, 10:07 PM   #14
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Default RE: Symptoms of a bad fuel pump?

a new fuel pump is about $15 or so,...............you can replace them very easy,..........."so easy, even a cave man can do it"..........
park it pointed downhill, and, if, in the morning, you have a gas stain on the street,.........you have a bad fuel pump. the diaphrams are thin rubber, and wear out, dry out, shrivel up,..........
i'd check filter, and pump, etc. pull the line off, try to start the car, and see if there's a lot of gas flowing out of it via a second person watching. if no gas is making it there, then your problem is before that point,.........if you are getting lots of gas there, then the probelm is in your carb. shoot a bunch of carb cleaner in there,..........where the line goes into the carb, and wait, keep doing that for a little while. could be a ball of goo in there...........just did that on mine. happens every once in a while.

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Old 04-03-2008, 01:10 PM   #15
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Default RE: Symptoms of a bad fuel pump?

Thunder... nope, no improvements yet. I've just decided to admit that I'm not awesome at diagnosing this stuff, so I'm going to take it in to a local shop to check it out for me. I wanted to do it all myself, but I can't find the problem. You don't by chance know of someone that could work on it for me, do you?

I'll let you know what I find out!
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Old 04-03-2008, 01:40 PM   #16
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Default RE: Symptoms of a bad fuel pump?

try this first. get a can of carb cleaner. take the fuel line OFF, where it goes into the carb. have someone sit in the car, and try to start it. if fuel comes out, then your pump is working fine,.............it it barely trickles out, you've got a plugged line, and or your pump is bad. parts are dirt cheap,...........you dont need to pay $75 an hour on this problem.....................
if all that works, then you've got a plugged carb, which i just had, and i stuck the can of carb cleaner in there, and sprayed,.........where the line goes in.
mine fired right up. try that,...........and if nothing happens, at least you can say you tried. make sure you've got fuel in teh tank too,...........one of my friends replaced his pump, only to find out he was STILL out of gas.................
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Old 04-04-2008, 02:24 AM   #17
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Default RE: Symptoms of a bad fuel pump?

Carb rebuild kits are affordable and easy to do
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Old 04-06-2008, 05:57 PM   #18
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Default RE: Symptoms of a bad fuel pump?

Great news... She's running strong! I just decided t o replace the fuel pump and filter, and she's never driven better... I'm very excited to head out for a good drive tonight! Thanks for all your help!
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Old 04-06-2008, 05:57 PM
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