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Topic: Fuel pump?

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Fuel pump? (1/12)
7/6/08 6:21pm

jbox1
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Joined: 9/1/2006
Posts: 31

Need some advice. Drove the 68 the furthest I've ever driven it one way, about 90 miles a couple of weekends ago, to a Vette show. On the way home, it started wanting to cut out on me, and didn't want to go over about 30 mph without coughing. It did cut out at a stop sign while still in drive. The weird thing is when it is in park, it feels like it revs fine, plenty of gas. I took the aftermarket inline fuel filter off today, and it's flowing fine. So other prevailing opinions are replace the fuel pump. Anybody think any different? What about the filters that lead to the carbs?

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Fuel pump? (2/12)
7/6/08 7:36pm

Adams' Apple

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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 20128

Could be the pump, but it could also be the "sock" filter in the fuel tank...they have a tendency to clog up after driving, and over the years, they may clog up enough to need replacement.
Remember, too, that your Tri-Power is really only runnin on the center carb until you get on it...then the end carbs come on-line.

Sometimes you can determine if the sock is clogged by removing the fuel line at the pump, and blowing back thru the line to the tank...with the gas cap off, of course. If there seems to be a fair amount of resistance, then the sock is probably in need of replacement.
If it seems to be fairly clear, then you are most likely looking at a pump problem.

Another possibility is the coil...it can cause the same symptoms.

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Fuel pump? (3/12)
7/6/08 8:03pm

Ten15
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East Hanover, NJ - USA

Vette(s):
'68 Black Conv. Matching 327/300 4 Spd. P/S, P/B, P/W, Tele, A/C

Joined: 9/25/2004
Posts: 525

Jim,

Do you have a breaker-less ignition like a Pertronix?

The same thing happened to a friend & that was the culprit.

Anthony

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Fuel pump? (4/12)
7/6/08 9:15pm

kstyer

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CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!

Joined: 12/2/2003
Posts: 6424

Another thought, but a bit out there. I have seen it several times.

The charcoal cannister may be not venting the tank. After driving several miles the fuel pulled from the tank creates a vacuum, which in turn restricts fuel being pulled from the tank. If this is the case, removing the gas cap cures the problem.

Not likely the problem, but could be.

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Fuel pump? (5/12)
7/7/08 12:13am

Adams' Apple

That's definitely an idea...does the '68 Tri-Power have a vented cap?
I've seen that happen too...it happened on my '85...took me a while to figure it out, but the metal line from the tank to the canister was clogged up. When I would remove the cap, it would be under vacuum(in colder weather)...in hot weather, it became hard to start after driving, unless I took the cap off to vent the pressure.
Dang cars is gonna drive me NUTS!!! and I kinda like drivin...

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Fuel pump? (6/12)
7/9/08 10:56am

jbox1
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Joined: 9/1/2006
Posts: 31

Wow, the variety of replies tells me this could be a trouble shooting adventure. I have ordered a new fuel pump; if it ends up not being the problem, i'll have a new pump!

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Fuel pump? (7/12)
7/10/08 4:52pm

aceinthehole

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Manteca, CA - USA

Vette(s):
1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed

Joined: 11/20/2005
Posts: 3623

I'm not certain of the fuel line arrangement on the '68, but any rubber fuel hose between the tank and carb should be checked for cracks, unless your certain they've been changed recently. I've seen them so bad after 30 yrs. that it's a wonder they passed fuel at all. It can act just like the fuel pump going bad.

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Fuel pump? (8/12)
7/10/08 7:56pm

BKVETTE
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Calhoun City, MS - USA

Vette(s):
1977 Black T-Top

Joined: 9/24/2005
Posts: 121

My Brother-n-law had a similar problem. He took a long trip and the farther he drove the weaker the car got. Finally wouldn't hardly pull at all. Turned out to be a kinked fuel line, where it made the curve to go up to the fuel pump.

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Fuel pump? (9/12)
3/21/09 12:27pm

Larry1
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Carmel, IN - USA

Vette(s):
1977 Silver Blue T-Top

Joined: 9/24/2005
Posts: 3

Beautiful job on the paint! I have a '77 that looks about like yours did. Did you paint it yourself? I'm contemplating trying it but haven't received a lot of encouraging feedback.

Thanks,

Larry

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Fuel pump? (10/12)
5/15/09 2:25pm

DericsDad
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Tucson, AZ - USA

Vette(s):
1969 Convertible Small Block 3 Speed Manual.

Joined: 4/6/2009
Posts: 21

Can you tell me how your got resolved? My 69 is having the same issue right now and the fuel pump was just replaced.

Thanks

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Fuel pump? (11/12)
5/15/09 10:40pm

BKVETTE
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Calhoun City, MS - USA

Vette(s):
1977 Black T-Top

Joined: 9/24/2005
Posts: 121

[QUOTE=Larry1]Beautiful job on the paint! I have a '77 that looks about like yours did. Did you paint it yourself? I'm contemplating trying it but haven't received a lot of encouraging feedback.

Thanks,

Larry

[/QUOTE]No Larry. A friend painted it and wouldn't charge me anything. I couldn't get him to quote a price so i gave him $1000. I helped with some of the sanding and he had to do quiet a bit of bodywork.

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Fuel pump? (12/12)
5/27/09 12:27am

wetvet
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Lake Oswego, OR - USA

Vette(s):
1972 Steel Cities Gray T Top. Original Owner, Original Paint and Interior. The running gear has been rebuilt. only 250,000 miles on the clock..

Joined: 10/17/2003
Posts: 553

How about checking the gas cap, vented or non vented, and the charcoal canister filter on the bottom of the canister.

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