I am having a problem with my fresh 462 in my truck. I am pretty sure it's the fuel pump. I was driving it last night after sitting for 2 weeks while I was away. 3 times while on the highway, the motor would start sputtering and cutting out. It would only do this after driving on an extended uphill though. As soon as the road leveled out, or went downhill, it was fine. I did notice that it took quite a long time to get the motor fired up after sitting 2 weeks, probably close to 30 seconds of cranking. When I first started it 3 weeks ago for break in, it took nearly a minute of cranking for fuel to get to the carb. I also had noticed that the motor is not making the power I expected, and doesn't like to rev past 3k or so RPM. Off idle and low rpm TQ is strong, but falls off quickly. I originally chalked it up to a poor curve in the HEI dist, but I'm thinking that's not so much the case now. The fuel pump is the original issue '76 carb that the motor had from the factory (still has traces of corp GM blue on it). What I'm wondering, is will I be able to get away with the standard 455 fuel pump, or am I going to need the Stg 1 pump? I would prefer to use the std. pump so I don't have to cut up the steel line going from the pump to the carb. My setup is : '76 455 block bored .030" '72 non-stg heads, 3 angle valve job, stock '76 stamped rockers Hypereutectic pistons, 9.0:1 calculated compression Straightline Perf. Cam - 220/235, .473/.476 lift, 112 LSA, degreed using the rollmaster timing set. Thanks!
I would suggest a new fuel pump. Also, install an in-line glass fuel filter so you can see the fuel flowing. I have them in all my cars and it will show poor fluid flow and/or contamination.
I would definately NOT recommend a glass filter,better off getting the plastic see through ones,i`ve heard peoples cars being burned to the ground with those glass filters. Thanks
I have used the see thru plastic filters before, they are nice, but I don't want to hack up my stock steel fuel line. If I was going to use a see thru filter, I'd prefer to put it before the pump, on the small stretch of rubber line that is there. I don't want any rubber line between the pump and the carb. My biggest concern is whether or not I can get away with a non-stage fuel pump with my engine combination, or if a stg. 1 pump is necessary. Thanks
