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#1
10-08-2012, 11:50 AM
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When did the fuel pumps go from longer to the shorter ones?
I am having trouble with my new metal fuel line that goes from the pump to the carb. The car is a 76 Trans Am with a 455 engine with AC. I see that from around 1974 back some used a longer fuel pump (had the larger section at the bottom) and mine has the pump with the smaller section at the bottom. If my pump was the longer one it looks like the line would connect like it should but right now its about 1-1/2" to 2" below the fitting on the pump. Is there any reason the longer one would not fit my application? Why is there different ones? My fuel pump is brand new and installed already so I do not think the parts place would exchange it.
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#2
10-08-2012, 12:07 PM
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The longer one is usually used on the higher HP engine or with AC.
(usually 350's or 2 bbls had the shorter pump) It is basically the same. The bottom section just holds more fuel. I would think your car should have the longer pump? 
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
10-08-2012, 12:37 PM
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I think mine might have had the longer pump?
I just looked at my old fuel line and years ago I cut the metal line up by the carb and put a filter in line but it looks like the metal line at the bottom might have been bent a little to match up with the shorter pump? It might have the longer pump but I cannot remember. The parts places show the shorter pump but now I am not sure if its correct. Does anyone know for sure what pump came on a 76 455?
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#4
10-08-2012, 12:47 PM
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Rock Auto shows the large bottom piece for the 455 w A/C
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#5
10-08-2012, 05:57 PM
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Any reason longer pump would not fit my engine/car
Any reason the longer pump would not fit my car/engine correctly? I think there should be plenty of room but maybe someone else knows of a reason to stay with the shorter pump.
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#6
10-08-2012, 06:16 PM
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I have a 455 in my 75 TA and it has the bigger pump on it so you should have no problem. I would guess the new pump costs just as much as a new line.
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#7
10-09-2012, 12:03 AM
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The canister style pump is usually for A/C cars. Different years have the fuel lines at the bottom of the pump facing different directions. Does you car have a vapor return? If you want the longer pump for your car try looking up the part for your car with A/C and 455. It should do the trick.
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1978 Black & Gold T/A [complete 70 Ram Air III (carb to pan) PQ and 12 bolt], fully loaded, deluxe, WS6, T-Top car - 1972 Formula 455HO Ram Air numbers matching Julep Green - 1971 T/A 455, 320 CFM Eheads, RP cam, Doug's headers, Fuel injection, TKX 5 Spd. 12 Bolt 3.73, 4 wheel disc. All A/C cars |
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