Mechanical fuel pump replacement question.
05-11-2017, 08:05 PM
#1
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Car: 1987 Firebird Formula
Engine: Carbureted - 305
Transmission: 700R4
Mechanical fuel pump replacement question.
Hi, I am going to replace the original mechanical fuel pump on a 305 carburetor engine.
There are two fuel lines going to the pump from the tank, one larger, I assume its the fuel supply and a smaller one, which might be the return line. My question is: if I remove the rubber lines to replace them, will I get fuel flow from the tank. Is the tank higher or lower than these lines?
thanks in advance,
Louis
There are two fuel lines going to the pump from the tank, one larger, I assume its the fuel supply and a smaller one, which might be the return line. My question is: if I remove the rubber lines to replace them, will I get fuel flow from the tank. Is the tank higher or lower than these lines?
thanks in advance,
Louis
05-11-2017, 09:18 PM
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Mechanical fuel pump replacement question.
Buy the Carter M6626 pump. Only about $20. It will be an upgrade.
05-12-2017, 01:13 AM
#5
Re: Mechanical fuel pump replacement question.
Don't buy a cheap Chinese fuel pump,...... Most cheap aftermarket pumps have a weak internal spring on the 'rod lever' that causes a "click" or "TICK" sound that sounds like an internal engine problem. When sitting in the car the sound seems to come from the tranny tunnel like a cracked flywheel or a bad rocker arm / lifter tick.
This pump had only a few hundred miles on it when it started Ticking. The TICK was worse at start-up but was always present. I thought the newly rebuilt engine had a major problem - but it was just a cheap pump. ( worked fine ) Re-set the rockers 3 times and then replaced the rollers with stock steel and even had the car on ramps ready to pull the tranny cause I figured it had to be a cracked flywheel. I got under the car on ramps after starting it up and realized that I could hear the TICK loud near the back driver tire ??? That's when I realized the TICK sound was traveling thru the fuel line............
This pump had only a few hundred miles on it when it started Ticking. The TICK was worse at start-up but was always present. I thought the newly rebuilt engine had a major problem - but it was just a cheap pump. ( worked fine ) Re-set the rockers 3 times and then replaced the rollers with stock steel and even had the car on ramps ready to pull the tranny cause I figured it had to be a cracked flywheel. I got under the car on ramps after starting it up and realized that I could hear the TICK loud near the back driver tire ??? That's when I realized the TICK sound was traveling thru the fuel line............
05-12-2017, 07:53 AM
#6
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Car: 1987 Firebird Formula
Engine: Carbureted - 305
Transmission: 700R4
Re: Mechanical fuel pump replacement question.
Thanks guys, I have the carter pump on order.I am glad to see we are on the same boat on pumps.
Louis
Louis
05-12-2017, 10:29 AM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: Mechanical fuel pump replacement question.
Don't buy a cheap Chinese fuel pump,...... Most cheap aftermarket pumps have a weak internal spring on the 'rod lever' that causes a "click" or "TICK" sound that sounds like an internal engine problem. When sitting in the car the sound seems to come from the tranny tunnel like a cracked flywheel or a bad rocker arm / lifter tick.
This pump had only a few hundred miles on it when it started Ticking. The TICK was worse at start-up but was always present. I thought the newly rebuilt engine had a major problem - but it was just a cheap pump. ( worked fine ) Re-set the rockers 3 times and then replaced the rollers with stock steel and even had the car on ramps ready to pull the tranny cause I figured it had to be a cracked flywheel. I got under the car on ramps after starting it up and realized that I could hear the TICK loud near the back driver tire ??? That's when I realized the TICK sound was traveling thru the fuel line............
This pump had only a few hundred miles on it when it started Ticking. The TICK was worse at start-up but was always present. I thought the newly rebuilt engine had a major problem - but it was just a cheap pump. ( worked fine ) Re-set the rockers 3 times and then replaced the rollers with stock steel and even had the car on ramps ready to pull the tranny cause I figured it had to be a cracked flywheel. I got under the car on ramps after starting it up and realized that I could hear the TICK loud near the back driver tire ??? That's when I realized the TICK sound was traveling thru the fuel line............
on the 6626. 
