fuel pump differences
Thread Starter
Pro
Joined: Dec 2006
Posts: 592
Likes: 3
From: Austin Tx
fuel pump differences
I have a 64 that has a 70 (based upon number of block and distributor) 350 (4 bolt main) instead of the 327. I replaced the bad fuel pump (mechanical) with a 327 fuel pump not knowing any different at the time. I got the car running and the fuel pump is moving all over the place! Are the arms in the fuel pump different? or are the push rods different lengths in a 350 than a 327? I know pressure and volume can be different from pump to pump, but does that mean the arm is different (the arm that goes into the block)?
Thank you.
Thank you.
Team Owner
Joined: Oct 2000
Posts: 38,897
Likes: 1,926
From: Washington Michigan
All small-block fuel pumps are functionally interchangeable, and use the same pushrod and mounting hardware. What do you mean about "it's moving all over the place"?
There's a mounting plate that bolts to the block with two bolts at the bottom, and the fuel pump then mounts on that plate with two bolts that go through holes in the plate into the block.
There's a mounting plate that bolts to the block with two bolts at the bottom, and the fuel pump then mounts on that plate with two bolts that go through holes in the plate into the block.
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
ALL S/B pumps are the same. They do look like B/B pumps but wont work, it brakes the arm. You may now have a bent F/P push rod. Check the numbers off the pump at any good auto parts store. Some may get miss-placed in the wrong box from employees and customer handling.
Thread Starter
Pro
Joined: Dec 2006
Posts: 592
Likes: 3
From: Austin Tx
fuel pump
Sorry about that. I should be more specific. The pump body appears to flex and move while running. I first noticed this when the in line fuel filter was moving around. I grabbed the hard line and noticed that it was moving also. I looked down at the fuel pump and it appeared to be moving in a pulsating manner as if it were flexing each time the push rod would come down to actuate the fuel pump. At first glance I thought the fuel pump was loose, but there is not any leaking oil, and I am sure that I tightened it. I will double check that later today. Has anyone heard of this? I thought maybe the arm length was different or the rod length was different. It is an A/C Delco pump. I was under the impresssion that just about any sbc fuel pump would work.
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
If your pump housing isn't cracked like described above, check to make sure your bolts are clamping the pump tight to the block. Your bolts may be too long and are bottomed in the threaded holes.
Thread Starter
Pro
Joined: Dec 2006
Posts: 592
Likes: 3
From: Austin Tx
fuel pump
Would the pump still work? I "thought" I pushed the rod back into the block. I put a bolt in the front to hold it then once the pump was installed I removed the long bolt.
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I've been proven wrong here for other things before though.