Fuel Pump Life?
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Cargo Master
Joined: Feb 2004
Posts: 2,070
Likes: 169
From: Central Texas
Fuel Pump Life?
The X in my sig has about 175K on it and while it runs fine unloaded it is problematic towing our 29' TT ~8,000lbs. At times it runs 70 - 80 no problem, other times it can hardly hold 60 and sucks fuel, like 5MPG.
Headwind, hills, and fuel type aside, this is the case. No check engine light ever, it just has no power AT TIMES. I've been through injectors, fuel filter, plugs, etc, etc. no difference. New Snap-on SOLAS Ultra scanner finds no issues, oddly it has not diagnosed other vehicle odd fuel pump issues either. Alas, a pump has been known to restore others with very similar traits (mainly Chevy's...well all Chevy's). You might guess I twist wrenches, making this...well, embarrassing.
Could this be the pump? I'm at a loss.
Headwind, hills, and fuel type aside, this is the case. No check engine light ever, it just has no power AT TIMES. I've been through injectors, fuel filter, plugs, etc, etc. no difference. New Snap-on SOLAS Ultra scanner finds no issues, oddly it has not diagnosed other vehicle odd fuel pump issues either. Alas, a pump has been known to restore others with very similar traits (mainly Chevy's...well all Chevy's). You might guess I twist wrenches, making this...well, embarrassing.
Could this be the pump? I'm at a loss.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Could be, but why sometimes and not others? Usually they start to wear and can't build pressure, but that's it - it does it and doesn't come back.
Maybe a bad connection somewhere - first place to start would be the fuel pump relay. I've seen it quite a few times with different makes, Chevy, Ford, whatever. The fuel pump relay starts to go, gets hot, builds resistance, the fuel pump can't run as fast as it should, overheats and eventually fails. Replace the fuel pump, it runs a few months and then does it again - bad pump? Nope, bad relay.
Maybe a bad connection somewhere - first place to start would be the fuel pump relay. I've seen it quite a few times with different makes, Chevy, Ford, whatever. The fuel pump relay starts to go, gets hot, builds resistance, the fuel pump can't run as fast as it should, overheats and eventually fails. Replace the fuel pump, it runs a few months and then does it again - bad pump? Nope, bad relay.
Thread Starter
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Cargo Master
Joined: Feb 2004
Posts: 2,070
Likes: 169
From: Central Texas
Could be, but why sometimes and not others? Usually they start to wear and can't build pressure, but that's it - it does it and doesn't come back.
Maybe a bad connection somewhere - first place to start would be the fuel pump relay. I've seen it quite a few times with different makes, Chevy, Ford, whatever. The fuel pump relay starts to go, gets hot, builds resistance, the fuel pump can't run as fast as it should, overheats and eventually fails. Replace the fuel pump, it runs a few months and then does it again - bad pump? Nope, bad relay.
Maybe a bad connection somewhere - first place to start would be the fuel pump relay. I've seen it quite a few times with different makes, Chevy, Ford, whatever. The fuel pump relay starts to go, gets hot, builds resistance, the fuel pump can't run as fast as it should, overheats and eventually fails. Replace the fuel pump, it runs a few months and then does it again - bad pump? Nope, bad relay.
Guest
Joined: Nov 2004
Posts: 7,988
Likes: 55
From: north west new jersey
intank pumps can be hard to pin point for any tech, i've changed them from 25 k up to 200k, depends on how many times the driver runs the tank down to nothing and over heats the gasoline cooled pump. as a former dealer tech i found when people fill up at 1/4 the pumps run a lot longer then when run near bone dry,
but at 175k i would think trying a new filter first to see what comes out of the old would be a starting point.
my 05 felt weak about a year old. dropping the filter and draining it showed a black mess inside it and a return of some power.
but at 175k i would think trying a new filter first to see what comes out of the old would be a starting point.
my 05 felt weak about a year old. dropping the filter and draining it showed a black mess inside it and a return of some power.
Thread Starter
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Cargo Master
Joined: Feb 2004
Posts: 2,070
Likes: 169
From: Central Texas
intank pumps can be hard to pin point for any tech, i've changed them from 25 k up to 200k, depends on how many times the driver runs the tank down to nothing and over heats the gasoline cooled pump. as a former dealer tech i found when people fill up at 1/4 the pumps run a lot longer then when run near bone dry,
but at 175k i would think trying a new filter first to see what comes out of the old would be a starting point.
my 05 felt weak about a year old. dropping the filter and draining it showed a black mess inside it and a return of some power.
but at 175k i would think trying a new filter first to see what comes out of the old would be a starting point.
my 05 felt weak about a year old. dropping the filter and draining it showed a black mess inside it and a return of some power.
Still a head scratcher...
Freshman User
Joined: Apr 2009
Posts: 41
Likes: 2
From: eastern Montana
Well, just my .02 worth of speculation. You mentioned that you saw some water in your old fuel filter and that has me wondering if your gas tank could have become contaminated by some water and assorted crud, perhaps from some bad gas.
I had a similar issue with my Superduty, in my case brought on by a faulty gasket on the ring assy on top of the tank. My fuel pump became clogged and weak, causing intermittent loss of power...worse than what you described. In my case though, I could see a loss of fuel pressure under load.
I ended up dropping the gas tank and found alot of dirt and debris floating around in it and the fuel pump had deposits of dirt in the socks and wherever it could settle. Cleaned out the gas tank, replaced the fuel pump assembly and replaced the bad gasket. It's been running good ever since.
I had a similar issue with my Superduty, in my case brought on by a faulty gasket on the ring assy on top of the tank. My fuel pump became clogged and weak, causing intermittent loss of power...worse than what you described. In my case though, I could see a loss of fuel pressure under load.
I ended up dropping the gas tank and found alot of dirt and debris floating around in it and the fuel pump had deposits of dirt in the socks and wherever it could settle. Cleaned out the gas tank, replaced the fuel pump assembly and replaced the bad gasket. It's been running good ever since.
Thread Starter
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Cargo Master
Joined: Feb 2004
Posts: 2,070
Likes: 169
From: Central Texas
Well, just my .02 worth of speculation. You mentioned that you saw some water in your old fuel filter and that has me wondering if your gas tank could have become contaminated by some water and assorted crud, perhaps from some bad gas.
I had a similar issue with my Superduty, in my case brought on by a faulty gasket on the ring assy on top of the tank. My fuel pump became clogged and weak, causing intermittent loss of power...worse than what you described. In my case though, I could see a loss of fuel pressure under load.
I ended up dropping the gas tank and found alot of dirt and debris floating around in it and the fuel pump had deposits of dirt in the socks and wherever it could settle. Cleaned out the gas tank, replaced the fuel pump assembly and replaced the bad gasket. It's been running good ever since.
I had a similar issue with my Superduty, in my case brought on by a faulty gasket on the ring assy on top of the tank. My fuel pump became clogged and weak, causing intermittent loss of power...worse than what you described. In my case though, I could see a loss of fuel pressure under load.
I ended up dropping the gas tank and found alot of dirt and debris floating around in it and the fuel pump had deposits of dirt in the socks and wherever it could settle. Cleaned out the gas tank, replaced the fuel pump assembly and replaced the bad gasket. It's been running good ever since.
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Guest
Joined: Nov 2004
Posts: 7,988
Likes: 55
From: north west new jersey
try to remeber the new gas blends with a lot of ethonal in it .allow any water from the stations tanks or even air from unsealed storage cans ,can soak up the h2o content of humidity in the air and to form pools or large bubbles of water to form inside any gas tank.
this also a reason not to store gasoline for items such as lawn mower for longer then 30 days.
hope you found your problem and have it fixed by now man,
this also a reason not to store gasoline for items such as lawn mower for longer then 30 days.
hope you found your problem and have it fixed by now man,
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Thread Starter
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Cargo Master
Joined: Feb 2004
Posts: 2,070
Likes: 169
From: Central Texas
I thought I'd provide an update on this issue and actually contribute to this site instead of take....which I will do right after this post.
We (neighbor and I) replaced the pump and it fixed it. Funny thing is you couldn't tell until we tied onto the camper which is where the problem was first noticed. PSI was 35, but slow to get there but really didn't drop much on the full flow test, so you really wouldn't say the pump was bad from that, but it definitely fixed it. BTW, the tank was clean as a pin.
With the power restored we decided a new bigger camper was needed which is where I'm headed next, gotta upgrade hitches and suspension....in the Excursion forum.
We (neighbor and I) replaced the pump and it fixed it. Funny thing is you couldn't tell until we tied onto the camper which is where the problem was first noticed. PSI was 35, but slow to get there but really didn't drop much on the full flow test, so you really wouldn't say the pump was bad from that, but it definitely fixed it. BTW, the tank was clean as a pin.
With the power restored we decided a new bigger camper was needed which is where I'm headed next, gotta upgrade hitches and suspension....in the Excursion forum.
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