The Ford Barn

JT FORD · 07-24-2011, 06:13 PM

Can anyone give me the stroke of the rod??? I think the length is 10-1/8 inches, but I need to know the stroke length. Having a problem with the pump not delievering the fuel out of the pump..........

ken ct · 07-24-2011, 06:28 PM

.200-.250 is in the ball park. ken ct.

19Fordy · 07-24-2011, 06:30 PM

Check and make sure the rubber diaphragm inside the pump doesn't have a small pin hole in it. Also check to make sure gas is not going into your oil pan.

jdl · 07-24-2011, 06:57 PM

Ford 8BA shop manual shows .185 min .200 max.

ford38v8 · 07-24-2011, 07:12 PM

If it is a stroke issue, it's not likely that your rod stroke has changed. More likely your full stroke isn't being translated to the diaphram. This can happen in two ways: The rocker arm pivot point is wallowed out, or your pumpstand gasket is too thick.

Walt Dupont--Me. · 07-24-2011, 08:34 PM

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I've checked alot of them, new cam stroke .200 As someone said, sometimes there is alot of slop in the pump arm. Alot of times I've brass up about 1/8in. on top of the rod. Check your fuel pressure with a guage. Should be around 3#. Walt

JT FORD · 07-25-2011, 09:58 AM

Thanks to the replies on the stroke length......I measured mine the best measurement I got was right at .200 plus or minus a few thousands. So the cam is ok. New pump on order at NAPA. I am getting a new rod also
mine has been welded on and looks like a beaver has been chewing on it the top end!

ken ct · 07-25-2011, 10:10 AM

Good luck with your NAPA pump from China. ken ct.

JBD · 07-25-2011, 06:26 PM

I just solved a fuel pump problem with my 8BA. If you do a search of threads on this site "8BA fuel pump" you will get several threads that address different problems. I have a dual action fuel pump on my 8BA and it works fine except after 20-30 minutes it starts to stall or hesitate, like a vapor lock. I kick in my electric and let it pump for a minute or two and everything is fime for 20-30 minutes. My pump was recently rebuilt so I was pretty sure that wasn't my problem. I took the push rod out and it measured a touch over 10 inches. The correct length is 10 1/16 inches. Look all over for a new rod and couldn't find one. Went to East Texas Fasteners and got a 7/16 water harden rod and made my own push rod. To allow for wear, I made my rod 10 1/8 inches because you have wear on both the cam end and the pump end. I used liquid gasket for the pump to engine to make sure I had enough lift. I think .200 is about right. Anyway have taken a couple 15 mile drives and no more hesitation. It was a hot day (Tyler, Texas has had 26 days of 3 digit temps and most likely the entire month of July will be in the triple digits) and it worked fine. Good luck, JBD

ken ct · 07-25-2011, 06:46 PM

I have the correct rods for the 8BA. ken ct PM or email [email protected].

07-24-2011, 06:13 PM	#1
JT FORD Senior Member Join Date: May 2010 Location: N.W. Iowa Posts: 306	8BA fuel pump rod stroke? Can anyone give me the stroke of the rod??? I think the length is 10-1/8 inches, but I need to know the stroke length. Having a problem with the pump not delievering the fuel out of the pump..........

07-24-2011, 06:28 PM	#2
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: 8BA fuel pump rod stroke? .200-.250 is in the ball park. ken ct.

07-24-2011, 06:30 PM	#3
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 10,932	Re: 8BA fuel pump rod stroke? Check and make sure the rubber diaphragm inside the pump doesn't have a small pin hole in it. Also check to make sure gas is not going into your oil pan.

07-24-2011, 06:57 PM	#4
jdl Senior Member Join Date: May 2010 Location: California Central Coast Posts: 931	Re: 8BA fuel pump rod stroke? Ford 8BA shop manual shows .185 min .200 max.

07-24-2011, 07:12 PM	#5
ford38v8 Senior Member Join Date: Jul 2011 Location: SF Bay Area Posts: 6,641	Re: 8BA fuel pump rod stroke? If it is a stroke issue, it's not likely that your rod stroke has changed. More likely your full stroke isn't being translated to the diaphram. This can happen in two ways: The rocker arm pivot point is wallowed out, or your pumpstand gasket is too thick. __________________ Alan

07-24-2011, 08:34 PM	#6
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: 8BA fuel pump rod stroke? Sponsored Links (Register now to hide all advertisements) I've checked alot of them, new cam stroke .200 As someone said, sometimes there is alot of slop in the pump arm. Alot of times I've brass up about 1/8in. on top of the rod. Check your fuel pressure with a guage. Should be around 3#. Walt

07-25-2011, 09:58 AM	#7
JT FORD Senior Member Join Date: May 2010 Location: N.W. Iowa Posts: 306	Re: 8BA fuel pump rod stroke? Thanks to the replies on the stroke length......I measured mine the best measurement I got was right at .200 plus or minus a few thousands. So the cam is ok. New pump on order at NAPA. I am getting a new rod also mine has been welded on and looks like a beaver has been chewing on it the top end!

07-25-2011, 10:10 AM	#8
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: 8BA fuel pump rod stroke? Good luck with your NAPA pump from China. ken ct.

07-25-2011, 06:26 PM	#9
JBD Senior Member Join Date: May 2010 Location: Arp, Texas Posts: 123	Re: 8BA fuel pump rod stroke? I just solved a fuel pump problem with my 8BA. If you do a search of threads on this site "8BA fuel pump" you will get several threads that address different problems. I have a dual action fuel pump on my 8BA and it works fine except after 20-30 minutes it starts to stall or hesitate, like a vapor lock. I kick in my electric and let it pump for a minute or two and everything is fime for 20-30 minutes. My pump was recently rebuilt so I was pretty sure that wasn't my problem. I took the push rod out and it measured a touch over 10 inches. The correct length is 10 1/16 inches. Look all over for a new rod and couldn't find one. Went to East Texas Fasteners and got a 7/16 water harden rod and made my own push rod. To allow for wear, I made my rod 10 1/8 inches because you have wear on both the cam end and the pump end. I used liquid gasket for the pump to engine to make sure I had enough lift. I think .200 is about right. Anyway have taken a couple 15 mile drives and no more hesitation. It was a hot day (Tyler, Texas has had 26 days of 3 digit temps and most likely the entire month of July will be in the triple digits) and it worked fine. Good luck, JBD

07-25-2011, 06:46 PM	#10
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: 8BA fuel pump rod stroke? I have the correct rods for the 8BA. ken ct PM or email [email protected].