Aaron - I am running a MSD pump from Summit..
I found the problem today! It ran great in the garage but as soon as I pulled it out and first bump I hit it went to running rough and backfiring.
I cracked the fuel cell filler to make sure it wasn't a vent problem - problem continued.
I checked voltage to the pump - steady 13.54 volts but the pump was loud and very inconsistent.
It was either a pump or something restricting fuel before the pump. I have a filter and a LP pump priming the HP pump.
Before bypassing the LP pump I pulled the pre-pump filter and took the brass looking insert out. Screwed the housing back together and WAAALAAAA!!! IT RUNS!!!
I have had problems with this same filter before and will replace it with a better filter. I do have another filter after the HP pump also.
I found the problem today! It ran great in the garage but as soon as I pulled it out and first bump I hit it went to running rough and backfiring.
I cracked the fuel cell filler to make sure it wasn't a vent problem - problem continued.
I checked voltage to the pump - steady 13.54 volts but the pump was loud and very inconsistent.
It was either a pump or something restricting fuel before the pump. I have a filter and a LP pump priming the HP pump.
Before bypassing the LP pump I pulled the pre-pump filter and took the brass looking insert out. Screwed the housing back together and WAAALAAAA!!! IT RUNS!!!
I have had problems with this same filter before and will replace it with a better filter. I do have another filter after the HP pump also.
'74 Grocery Getter, '73 Project Buggy, '77 Parts Rig
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