The 302 I'm putting in my Mav is from a 84 Tbird. It was originaly a throttle body injection, I will be using a Holley 650 single line. The timing cover will be changed to an old style with the manual pump hole in it, I already have the timing cover. I don't figure this engine has a fuel pump drive bolted to the cam since it was always a electric pump and had no hole to bolt up a manual to the timing cover. I have an AC electric pump, one of the on demand style pumps I could use, not sure of the output psi, but I have ran this style pump before without any problems, or would I be better off to go ahead and put on a good manual pump? If I use a manual pump, which drive do I need to get, 1 piece or the 2 piece? The cam will be a Crane. This will be mostly a street cruiser, with maybe an occasional strip outing. Any comments or suggestions?
Street driven and not radical go with the manual fuel pump. ELectrics buzz to loud even when mounted on rubber. They both work about the same.....
not sure what it would take to run the manual pump....but I would go that route on a car that is not ALL strip.
i agree with lance about the loudness. i don't know of any electric that's reasonably priced that would be fairly quiet. if anyone knows one i'd sure like to know also. i've got an 87 roller block for my next project and haven't decided which way i'm gonna go with it.
you need a an eccentric and long eccentric pin/bolt and flat washer. I got mine from a 70 torino to include the timing cover and all accesory pullies. fits perfect on my 92 roller eng
I like electric just because it cleans up the looks of the motor. One less thing hanging off of it and one less accessory robbing power. I have heard an Eddlebrock pump and it was damn quiet.
I had a Holley Blue on my car that was LOUD. I was told that the Mallory comp 140 was supposed to be much more quiet. The Mallory comp 140 does have a different pitch to it...But its just as loud!
I stuck with the mechanical fuel pump for its reliability, but I am going to install a electrical fuel pump ( cheapie) as back up. best of both worlds. I have a powerfull amps that demand a lot of current and want to keep current draw to a minimun and the posibility of noise in the system. but the electrical fuel pump will be standing by as a limp home system/back up
To install the eccentric for a manual pump on a former EFI car you need to either change the timing set or mill .100" off the face of the cam sprocket. You can make a longer locating pin from a 5/16" grade 8 shoulder bolt, use the unthreaded portion cut to the length you need.
I use a 7 psi Bendix pump on my EFI to feed the high pressure pump. Its loud until the gas pressure builds up and goes very quiet. I like electric pumps, I belive they can be more consistant than a manual pump, where rpm could vary line pressures at different rpms,,,,, I had no luck with stock pumps, even better than stockers too,,, high pressure manual pumps can break the diaphram in a moments notice, dumping gas in the oil, or out the hole in the housing causing a fire. Go electric, keep the EFI timing cover, its a cleaner look, and less hassle if your engine dont need torn apart,, (unless you gotta tear it apart,,,) JMHO,, Chad
Thanks for all the suggestions. I have to change the timing cover anyway because of the dipstick is in the side of rhe rear sump pan, I am using a chrome front sump pan. I am changing both the cam and buying new timing chain and sprockets. My pump is an AC, it doesn't run all the time, only when gas is needed, sounds kinda like a burrp burrp, hard to explain. Don't know if I'll be able to hear it over the exhaust, anyway. Still undecided but leaning toward the electric...
Always an option, but a little more complex, is to use a external fuel injection pump (Walbro or equivalent) with a return style regulator and a line going back to the tank. These are relatively quiet, but I know it's a pain to run the lines and the regulator is not cheap. Just a thought.
