1970 chevelle ss - Chevelle Tech
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post #1 of 18 (permalink) Old Aug 20th, 19, 5:48 PM Thread Starter
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1970 chevelle ss

hey all i have another one for you guys, the car is a 70 SS 396 w/a/c when the car is at idle and it idles well, the main 3/8 rubber fuel line to the fuel pump pulses like a heart beat, speedup pulses faster. can it be a thin wall 3/8 fuel line or a bad fuel pump, i assume its the correct fuel pump its the can with 3/8 in and 1/4 return any ideas thanks guys.......

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post #2 of 18 (permalink) Old Aug 20th, 19, 6:40 PM
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Re: 1970 chevelle ss

The fuel pump makes a "pulse" every time the cam turns over.
Never noticed it in the fuel line, as the original was metal and mine is braided AN. Soft rubber maybe so. If you install a pressure gauge on the out side of the pump the needle will bounce back and forth.
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post #3 of 18 (permalink) Old Aug 20th, 19, 7:29 PM
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Re: 1970 chevelle ss

The rubber line may be deteriorating because of age, as the rubber weakens, it may be stretching with the pressure pulses from the pump. I would replace the line before it ruptures,.
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post #4 of 18 (permalink) Old Aug 20th, 19, 7:54 PM
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Re: 1970 chevelle ss

Might be best to not use rubber from pump to carb.
What say the experts?
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post #5 of 18 (permalink) Old Aug 20th, 19, 9:06 PM Thread Starter
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Re: 1970 chevelle ss

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Originally Posted by V1rotate View Post
The rubber line may be deteriorating because of age, as the rubber weakens, it may be stretching with the pressure pulses from the pump. I would replace the line before it ruptures,.
line is days old

lou
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post #6 of 18 (permalink) Old Aug 20th, 19, 9:08 PM Thread Starter
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Re: 1970 chevelle ss

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Originally Posted by roadster601 View Post
hey all i have another one for you guys, the car is a 70 SS 396 w/a/c when the car is at idle and it idles well, the main 3/8 rubber fuel line to the fuel pump pulses like a heart beat, speedup pulses faster. can it be a thin wall 3/8 fuel line or a bad fuel pump, i assume its the correct fuel pump its the can with 3/8 in and 1/4 return any ideas thanks guys.......
the fuel line from the tank to pump is doing this, never seen this before

lou
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post #7 of 18 (permalink) Old Aug 20th, 19, 9:14 PM
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Re: 1970 chevelle ss

Ha. Can't read. Put a new fuel line from tank to pump. Sucking shut.
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post #8 of 18 (permalink) Old Aug 20th, 19, 9:16 PM
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Re: 1970 chevelle ss

You shouldn’t see that. Is it a reinforced rubber hose? What’s the pressure rating?

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post #9 of 18 (permalink) Old Aug 20th, 19, 9:36 PM Thread Starter
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Re: 1970 chevelle ss

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You shouldn’t see that. Is it a reinforced rubber hose? What’s the pressure rating?
just a 3/8 fuel hose, you can see the hose move wierd

lou
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post #10 of 18 (permalink) Old Aug 20th, 19, 10:09 PM
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Re: 1970 chevelle ss

Take the hose OFF at the pump. Get a container and blow about 6--10 Lbs air into the tank,,,( good container, If NO restriction, You will get a TON of fuel) You may have a restriction in the tank, Bad Sock,collapsed pick up line, DEBRIS in the system, plugged vent hose.
Question, Did the car run and operate OK, Before the new lines?
Bob
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post #11 of 18 (permalink) Old Aug 21st, 19, 12:27 AM
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Re: 1970 chevelle ss

Fuel line is not meant for the suction side. It is pressure rated; not vacuum rated. Same reason you don't use it for your brake booster. It will collapse. Get the right metal line.
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post #12 of 18 (permalink) Old Aug 21st, 19, 8:49 AM Thread Starter
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Re: 1970 chevelle ss

Quote:
Originally Posted by Robinls5 View Post
Take the hose OFF at the pump. Get a container and blow about 6--10 Lbs air into the tank,,,( good container, If NO restriction, You will get a TON of fuel) You may have a restriction in the tank, Bad Sock,collapsed pick up line, DEBRIS in the system, plugged vent hose.
Question, Did the car run and operate OK, Before the new lines?
Bob
bob the car runs great before and after

lou
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post #13 of 18 (permalink) Old Aug 21st, 19, 8:52 AM Thread Starter
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Re: 1970 chevelle ss

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Originally Posted by LevonH View Post
Fuel line is not meant for the suction side. It is pressure rated; not vacuum rated. Same reason you don't use it for your brake booster. It will collapse. Get the right metal line.
hello did you read what i wrote all lines are steel from front to rear only rubber is in rear to connect fuel lines to tank and the the 3/8/1/4 line to pump the fuel supply line to the pump is pulsing you can see it i ask for thoughts

lou
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post #14 of 18 (permalink) Old Aug 21st, 19, 9:01 AM Thread Starter
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Re: 1970 chevelle ss

Quote:
Originally Posted by LevonH View Post
Fuel line is not meant for the suction side. It is pressure rated; not vacuum rated. Same reason you don't use it for your brake booster. It will collapse. Get the right metal line.
first of all all lines are steel front to rear there are 2 lines 3/8 1/4 at rear to hook up to the sender and in front short hoses to connect to the pump, so the 3/8 is the suction line has to be rubber not steel to connect to the pump if it was not the engine movement would crack the steel line so why is the rubber fuel line pulsing ty

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post #15 of 18 (permalink) Old Aug 21st, 19, 12:27 PM
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Re: 1970 chevelle ss

Lou, I understand the transition rubber at the tank and pump. Just make sure that it is rated properly. Not all rubber hoses are rated the same.

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