Fuel Pump?
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Senior User
Joined: Jun 2011
Posts: 123
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From: Inland Empire, CA
Fuel Pump?
Alright so last night my bump did not really want to start and after a few pumps she fired but ran really slow and clumpy, I had just drover her hard earlier so I thought maybe she was tired. This morning I could not get her to fire. starting fluid made no difference but a sputter.
after jumping my truck and some more starting fluid she kept starting and dying. After plenty of choice words at 6am, she started but with my foot on the floor she just idled extremely low. so I got her going and warm, seamed to be running and responding right, but my guess is dead pump (pumps quite a few years old), lines are newer and tank is clean.
Do pumps work and not work as they are dying? i know i can pull the line off the carb and check, but the intermittent part of my problem seams to be that 'something' is dying.
I have been driving her without issues for the past two weeks, this just started. she purrs normally and fires right up with a single pump.
any advise? should i add a 30 buck electric pump to help prim it up, or just replace the mechanical, or even both?
after jumping my truck and some more starting fluid she kept starting and dying. After plenty of choice words at 6am, she started but with my foot on the floor she just idled extremely low. so I got her going and warm, seamed to be running and responding right, but my guess is dead pump (pumps quite a few years old), lines are newer and tank is clean.
Do pumps work and not work as they are dying? i know i can pull the line off the carb and check, but the intermittent part of my problem seams to be that 'something' is dying.
I have been driving her without issues for the past two weeks, this just started. she purrs normally and fires right up with a single pump.
any advise? should i add a 30 buck electric pump to help prim it up, or just replace the mechanical, or even both?
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Alright so last night my bump did not really want to start and after a few pumps she fired but ran really slow and clumpy, I had just drover her hard earlier so I thought maybe she was tired. This morning I could not get her to fire. starting fluid made no difference but a sputter.
after jumping my truck and some more starting fluid she kept starting and dying. After plenty of choice words at 6am, she started but with my foot on the floor she just idled extremely low. so I got her going and warm, seamed to be running and responding right, but my guess is dead pump (pumps quite a few years old), lines are newer and tank is clean.
Do pumps work and not work as they are dying? i know i can pull the line off the carb and check, but the intermittent part of my problem seams to be that 'something' is dying.
I have been driving her without issues for the past two weeks, this just started. she purrs normally and fires right up with a single pump.
any advise? should i add a 30 buck electric pump to help prim it up, or just replace the mechanical, or even both?
after jumping my truck and some more starting fluid she kept starting and dying. After plenty of choice words at 6am, she started but with my foot on the floor she just idled extremely low. so I got her going and warm, seamed to be running and responding right, but my guess is dead pump (pumps quite a few years old), lines are newer and tank is clean.
Do pumps work and not work as they are dying? i know i can pull the line off the carb and check, but the intermittent part of my problem seams to be that 'something' is dying.
I have been driving her without issues for the past two weeks, this just started. she purrs normally and fires right up with a single pump.
any advise? should i add a 30 buck electric pump to help prim it up, or just replace the mechanical, or even both?
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
There are a lot of things to check and the fuel delivery is easy to check but you haven't even done that. Most of diagnostics has procedures that aren't just making guesses and throwing parts at it.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Not usually but it is possible. There are one way valves in there that normally let inbound gas stay inbound and the opposite for the outbound port. Maybe one of these is on it's way out.
Logistics Pro
Joined: Dec 2004
Posts: 4,651
Likes: 60
From: Hemet ca.
Is the mechanical pump the one with a canister? If so have you replaced the filter inside of it?
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Senior User
Joined: Jun 2011
Posts: 123
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From: Inland Empire, CA
Filter is newer. I'm just puzzled. Carb rebuilt last month, lines replaced last summer, been running and starting perfect. I can try another filter, I just want to fix before being stranded.
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Logistics Pro
Joined: Aug 2015
Posts: 4,093
Likes: 14
From: Lind, WA- Eastern WA
Take the fuel line off of the carb, put a hose on the metal tubing and get a 1 gal container. Have a friend crank the engine over as you point the hose into the container. It should have a strong surge of gas coming out. If it's just going out in sperts or drooling, check/replace the filter. Try again, same problem, get a new pump. Quality electric or stay with stock pump. You don't need or want both.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
Rubber lines between the tank and fuel pump can crack and suck air, even intermittently. I never replace a "bad" fuel pump unitil I check with a vacuum pump and a catch jar to make sure a good flow is available TO the pump. Also I've seen issues with the cam that drives the pump, though not often.
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Senior User
Joined: Jun 2011
Posts: 123
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From: Inland Empire, CA
So it's sucking at the canister. Pump and lines checked clear and good. Found it leaking today. Bought new filter and gasket but I can't get it to seal, like the gasket is to large. In the can it fits but flares on the pump. Unless I can get another gasket or shrink this one... I think I'm stuck again. Wasted and wearing gasoline with ice cold beer scratching my head. I had a hard time last time I changed the filter, but it sealed. Found crappy in the can too so I was sucking air and clogged.
Rabbit-Hole Researcher
Joined: Feb 2004
Posts: 466
Likes: 6
From: Middle of Ohio
I wonder if the filter can was screwed on too tight. "Flaring?"
I replaced mine with an electric 'Facet' pump about 15 years ago. Solved the high-altitude vapor-lock issue above 10,000 feet as a side benefit. And fills the carb after sitting for months. $50 ?
I replaced mine with an electric 'Facet' pump about 15 years ago. Solved the high-altitude vapor-lock issue above 10,000 feet as a side benefit. And fills the carb after sitting for months. $50 ?
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