This sounds like a fuel pump issue

This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 15th 2012, 12:14am

Hello all! I drove my van today, and it really started acting up...missing and stalling at red lights. It even refused to start. :banghead: It started doing it at a quarter of a tank according to the fuel gauge. It just got worse as it pasted the quarter mark. So, I got some gas, it filled a little bit over half tank. It idled fine and stopped missing AND stopped stalling. So, it sounds like a fuel pump issue. What do you guys thing? :confused:
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Re: This sounds like a fuel pump issue

Postby chevymaher » June 15th 2012, 12:37am

Or your fuel gauge is whacked. And it really out of gas.
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Re: This sounds like a fuel pump issue

Postby Duck Hunter » June 15th 2012, 1:04am

I was lucky, got home and parked van when go inside house.. a hour later was going to store, van wont start all it does is turn turn engine over nothing.. I just knew the pump is out.. hear other guys had same problems. I took it in had it fixed. pricey ouch! but some one cover it up for me.
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 15th 2012, 11:33pm

Heres an update. It doesn't matter how much gas it has, it will do it randomly. THIS IS SO CONFUSING!!! :banghead: Ok, I had a half a tank of gas, so I put $20 dollars in anyways, and it was running fine before and after I refueled it. I was driving around, and it stalled at a stop sign. It refused to idle and it had a hard start. :doh: I got to the firework store (Thats where I was going) I let the Astro rest for about 15 min. I came out, still didn't idle, and it had a hard start. (This is after I had a full tank) I decided to drive home, and it started running good again. :think: It idled and didn't stall. So...now it acts up RANDOMLY! Good to know, now I don't need to keep the fuel above a quarter anymore. This van puzzles me. :confused:
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Re: This sounds like a fuel pump issue

Postby chevymaher » June 15th 2012, 11:51pm

Did you ever put the new fuel pump in you mentioned.

Or put Lucas fuel injection cleaner.
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 16th 2012, 12:04am

chevymaher wrote:Did you ever put the new fuel pump in you mentioned.

Or put Lucas fuel injection cleaner.

Not yet. I might tomorrow, depending how busy I am. But...if the pump was overheating, wouldn't it continue to run bad until you stopped and allowed it to cool? Because I will be driving around and it will start to act up, and I continue to drive and it just comes out of it. I will change it anyways.
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Re: This sounds like a fuel pump issue

Postby chevymaher » June 16th 2012, 12:15am

When electric motors go out they take fits. Work a while then slow down. Brushes in the motor going bad. But on fuel pumps they generally die all at once.
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Re: This sounds like a fuel pump issue

Postby Big_kid » June 16th 2012, 4:03pm

When the fuel pump in the 96 I used to drive went out I was on the interstate. It started running like crap, then cleared up, then stalled, then started and ran, then acted up, then ran fine, then it quit. This took place over the course of 45 minutes or so.

When it doesn't start, do you hear the fuel pump trying to prime?
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 16th 2012, 4:17pm

Big_kid wrote:When the fuel pump in the 96 I used to drive went out I was on the interstate. It started running like crap, then cleared up, then stalled, then started and ran, then acted up, then ran fine, then it quit. This took place over the course of 45 minutes or so.

When it doesn't start, do you hear the fuel pump trying to prime?

Yes, I can hear it everytime. I'm actually starting to think it is the IAC motor.
When electric motors go out they take fits.

So maybe it is the IAC. Because I couple months ago, I took the IAC valve off and cleaned it. The little plunger thing was fully extended, and it was stuck there. It took some force to push it in. After that, I plugged it back in, and turned the key on and the little plunger moved. So I put it back together. So maybe the motor spazes out and makes it fully extended, blocking the passage for airflow...which would not allow it to idle. Also, the gasket fell off the IAC valve, but it didn't seem to effect anything, so I left it off. (Couldn't find it anyways)
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Re: This sounds like a fuel pump issue

Postby paintdrying » June 16th 2012, 10:34pm

The gasket off can create a small vacuum leak.
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 18th 2012, 3:55pm

Well its a good thing I didn't go buying parts for this...after the trip to the ocean, she is running great! My dad took the Astro to work today, and I through it would start messing up again when it is between being cold and warm...and it didn't! It continued to run like a dream! :D But what I don't get is...how could it do that? One day it is running like sh*t and the other it is running great? It just came out of it. Lets hope it stays this way...
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Re: This sounds like a fuel pump issue

Postby Leeann_93 » June 19th 2012, 4:11am

The pump on my Bravada only failed when hot. I could drive it up to 20 minutes before it would act up (I drove it to and from work for 2 weeks to get rid of the full tank of fuel I didn't want to deal with). After 20 minutes, fuggetaboutit.

Not all fuel pumps fail completely, not all fail without warning. Mine worked fine until it got hot. When I did the pressure and leakdown test, it was fine until the 3rd time I ran the test, when it warmed up a bit. Then it gave me screwy readings.

I'm not convinced your problem is the fuel pump, though. Sensor and/or computer issues can make the van run great, screwy, great....etc.
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 19th 2012, 1:53pm

Leeann_93 wrote:The pump on my Bravada only failed when hot. I could drive it up to 20 minutes before it would act up (I drove it to and from work for 2 weeks to get rid of the full tank of fuel I didn't want to deal with). After 20 minutes, fuggetaboutit.

Not all fuel pumps fail completely, not all fail without warning. Mine worked fine until it got hot. When I did the pressure and leakdown test, it was fine until the 3rd time I ran the test, when it warmed up a bit. Then it gave me screwy readings.

I'm not convinced your problem is the fuel pump, though. Sensor and/or computer issues can make the van run great, screwy, great....etc.

Yeah it got really bad yesterday! I was driving and it just would not idle! It was missing really bad too. Even after it warmed up! Usually it would go away after it got to operating temperate. Now it runs the way it did before I changed the pressure regulator.
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Re: This sounds like a fuel pump issue

Postby kramerhd » June 19th 2012, 2:11pm

When you get below 1/4 tank you run the risk of sucking up crap at the bottom of tank, and WATER(if any in tank)
Bad fuel from discount fuel stations will cause this as well.

discount fuel can be very
(OFF SPEC)~on many items(Knock,octane,flash,ect)
~this is turn will damage fuel pumps,injectors,and confuse the computer.....
~~Just saying[/color]
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 19th 2012, 2:27pm

kramerhd wrote:When you get below 1/4 tank you run the risk of sucking up crap at the bottom of tank, and WATER(if any in tank)
Bad fuel from discount fuel stations will cause this as well.

discount fuel can be very
(OFF SPEC)~on many items(Knock,octane,flash,ect)
~this is turn will damage fuel pumps,injectors,and confuse the computer.....
~~Just saying[/color]

Thats true! I would run bad when the fuel got below a quarter of a tank, so I kept it higher all the time.
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Re: This sounds like a fuel pump issue

Postby ccookie66 [OP] » June 21st 2012, 8:16pm

Well...heres a quick update. It doesn't run bad when it is past a quarter anymore (For whatever reason :roll: ). And, I am 95% sure it is the IAC valve. Because I would spray carb and throttle body cleaner (safe for o2 sensors! :thumbup: ) into the air intake while the van is running, the idle would die down pretty bad, then it would fast idle, then it would be normal. I did this a couple times and drove my van. It seems to be running pretty good now. I think the little plunger thing on the IAC is all gummed up with carbon and this cleaner is helping it move more freely. Lets hope it says this way.
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