Fuel Pump Eccentric and EFI - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 4 (permalink) Old 06-04-2009, 04:10 PM Thread Starter
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Fuel Pump Eccentric and EFI

I have a new Ford crate 351 that I'm in the process of converting to EFI for installation into a 96 mustang. I'm pretty new to the 351 (the mustang had a 4.6) so I'm learning as I go.

The motor came set up for carb, with a 1 piece eccentric for the mechanical fuel pump. I'm installing the Explorer timing cover (because I'm using the 94-95 mustang short water pump) and the timing cover doesn't clear the eccentric (the eccentric is about 1/2" to tall). This wasn't really a surprise. Here's the questions:

Can I remove the eccentric without worrying about it causing a balance/vibration problem with the cam? Is there some sort of eccentric washer I should be replacing this with? If so, I can get it where?

The dowel pin for the timing gear and eccentric is 1.5" (not 1.375" like I would have expected from what I've read). It sticks out .25" from the timing gear, so if I remove the eccentric, I either need a large .25" thick spacer washer that I can drill a hole into to replace the eccentric's thickness, or I need to cut .25" off the dowel pin. I've checked the bolt, and it will go in far enough to snug the timing gear down properly without the eccentric - although I think I need a larger washer to properly hold the timing gear so it won't shear the dowel someday. If I go the shorter dowel pin route, I'd prefer to hang on to my original, and get a 1.375" and cut it. I've looked and can't find anywhere that sells just the pin. Anyone have a source?

Any other ideas on best to deal with this are welcome.
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post #2 of 4 (permalink) Old 06-04-2009, 07:43 PM
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Re: Fuel Pump Eccentric and EFI

Removing it is not a balance issue. Have some one spin it and cut the eccentric off? Cams usually come with both pins so a lot of them have been tossed. Ford dealer may be the easiest to just get the FI parts.
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post #3 of 4 (permalink) Old 06-05-2009, 04:56 PM
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Re: Fuel Pump Eccentric and EFI

Tossed my mechanical fuel pump eccentric when I went with an electric pump.

65 mustang fstbk, pump gas street friendly Camshaft Innovations cammed .060 over 289, face plated T5. 11.12 at 122 mph and 1.53 60 ft all motor.
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post #4 of 4 (permalink) Old 06-05-2009, 07:17 PM
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Re: Fuel Pump Eccentric and EFI

well there's a couple ways to eliminate the eccentric. The right way would be to get a shorter pin. The "other" way would be to grind a section out of the washer that goes behind the bolt. There's normally a thick washer under the bolt head. I just usually grind a part of it back so that it fits over the pin. Doesn't hurt a thing as long as the cam bolt is tightened correctly. I figure that if it were a problem, I'd have had an issue with it by now...especially considering that I'm still using a 3/8" bolt (most solid roller cams now use a 7/16" bolt) and close to 310 lbs of spring pressure on the seat and 720 open.


Last edited by mavman; 06-05-2009 at 07:19 PM.
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