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 Post subject: Fuel delivery issue
 Post Posted: Tue Sep 25, 2018 7:39 pm 
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MalibuRacing Junkie
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Location: West, MI
Hey. The 78 El Camino has had a fuel delivery problem since ive owned it (14yrs). It don't do it all the time, So I can drive it for a wile before it starts. It will run great then it will act like its running out of fuel, when it happened the first time I installed a new fuel pump, The problem seemed to go a way. now with a different motor its back. So I take it up and down the street a few times nothing happened. Stop to do a burn out, out a bout three or four feet and it starts to die (like its running out of fuel), Pumping the gas peddle to get the next drive way, still pumping it, and it recovers. get to the garage let it idle for a wile and it starts to die (again like its running out of gas) and it dies. carb not getting fuel. With a can of gas I fill up the carb fuel bowl, starts up no problem, and it runs for a wile, definitely long enough for the pump to fill up the carb. So thinking the sending unit strain might be plugged. I remove the fuel tank and sending unit, and no clog the strainer is fine. To remove the fuel in the tank I blew in the fuel line and the fuel started draining, drained five gallons out using the sending unit. So im thinking the fuel strainer isn't plugged. So I guess ill put the strainer in the tank and put the tank back in the El Camino. I think Ill replace all the hoses (maybe one is sucking closed), and maybe replace the fuel pump. Not sure how old the pump is. What do you guys think ?

Doug

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1978 El camino
1981 Malibu SS


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 Post subject: Re: Fuel delivery issue
 Post Posted: Tue Sep 25, 2018 9:24 pm 
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MalibuRacing Junkie
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Is it better with the gas cap loose?

Tommy

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20k mile '80 Malibu, currently undergoing long term (aka no money) factory style install LS6 454, Cowl Induction, Legend LGT 700 5 speed. Full Global West suspension, 17" N90 wheels, 12" front/11" rear disc brakes, 9" 3.70 Auburn Pro posi.

"The older I get, the faster I was"


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 Post subject: Re: Fuel delivery issue
 Post Posted: Wed Sep 26, 2018 4:40 pm 
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MalibuRacing Junkie
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LS6 Tommy wrote:
Is it better with the gas cap loose?

Tommy


Never tryed it. What are you thinking ?

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1978 El camino
1981 Malibu SS


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 Post subject: Re: Fuel delivery issue
 Post Posted: Thu Sep 27, 2018 9:45 am 
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MalibuRacing Junkie
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The cap may unvented or the valve may be bad and you're getting vapor lock.

Tommy

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20k mile '80 Malibu, currently undergoing long term (aka no money) factory style install LS6 454, Cowl Induction, Legend LGT 700 5 speed. Full Global West suspension, 17" N90 wheels, 12" front/11" rear disc brakes, 9" 3.70 Auburn Pro posi.

"The older I get, the faster I was"


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 Post subject: Re: Fuel delivery issue
 Post Posted: Thu Sep 27, 2018 4:54 pm 
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MalibuRacing Junkie
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Location: West, MI
LS6 Tommy wrote:
The cap may unvented or the valve may be bad and you're getting vapor lock.

Tommy


Should I buy a new gas cap ?

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1978 El camino
1981 Malibu SS


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 Post subject: Re: Fuel delivery issue
 Post Posted: Thu Sep 27, 2018 6:33 pm 
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Top Fueler

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drive it without the cap see what happens.

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 Post subject: Re: Fuel delivery issue
 Post Posted: Fri Sep 28, 2018 5:37 pm 
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MalibuRacing Junkie
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The Gas tank is out. I thought the sock was plugged, But the sock looks good to me. Im going to Put the sender back in the tank and reinstall the tank. Ill buy a new gas cap and the rubber lines. hope that fixes the problem.

Thanks Doug

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1978 El camino
1981 Malibu SS


Last edited by DOUG213XRJ on Wed Oct 10, 2018 5:54 pm, edited 1 time in total.

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 Post subject: Re: Fuel delivery issue
 Post Posted: Wed Oct 10, 2018 5:36 pm 
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MalibuRacing Junkie
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Location: Upstate NY
Have you removed the emissions charcoal canister on the left front inner fender?

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 Post subject: Re: Fuel delivery issue
 Post Posted: Wed Oct 10, 2018 6:06 pm 
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MalibuRacing Junkie
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So I replaced the gas cap and all rubber lines. installed a glass see though fuel filter. The charcoal canister is gone and the line from the tank to the engine compartment are plugged up. So I ran a new rubber line from the tank charcoal canister line to the gas filler neck with a filter at the end. Seems fine so far but haven't drove it . rainy Michigan weather.


Doug

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1978 El camino
1981 Malibu SS


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 Post subject: Re: Fuel delivery issue
 Post Posted: Wed Oct 10, 2018 6:09 pm 
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MalibuRacing Junkie
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That's exactly what I was getting at. Unplug the line that you plugged that used to run from the canister. That's how your tank vents!

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'78 bu, 350/310 hp, M-21. Now with a GN 3.42 rear and Detroit Tru-Trac, Xtreme rims, grey bucket seat Monte interior


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 Post subject: Re: Fuel delivery issue
 Post Posted: Thu Oct 11, 2018 4:30 pm 
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MalibuRacing Junkie
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I tried to unclog the line for the charcoal canister with compressed air and a piece of wire, But to many bends so I ran a new vent line.

Doug

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1978 El camino
1981 Malibu SS


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 Post subject: Re: Fuel delivery issue
 Post Posted: Thu Oct 11, 2018 7:22 pm 
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what was the filter like when replacing it with the new one?


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 Post subject: Re: Fuel delivery issue
 Post Posted: Fri Oct 12, 2018 7:02 pm 
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MalibuRacing Junkie
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shoedoos wrote:
what was the filter like when replacing it with the new one?


looked good to me.

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1981 Malibu SS


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