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electric fuel pump issues

kbenz

kbenz

Well-known member
Joined
Jul 7, 2020
Member Number
2262
Messages
95
Loc
Kannapolis Nc
My carburated 383 stroker was built out of a newer block so a mechanical pump is not an option. This thing eats electric fuel pumps. Edelbrocks are the worst. lucky to get 30gallons of gas through it. Put a carter on it. lasted a month. I have a relay wired in. pump is mounted close to tank and lower than both tank and carb. pump is mounted on outside of frame away from any heat. I can't figure this thing out. Any ideas?? Thanks
 
What pumps have you tried? Filters? As m92pv4u asked. Carb size? Does your “383 stroker” really need a ton of fuel?

i haven’t found a decent low pressure return style adjustable regulator but for stockish applications I have had good luck using a cj7 filter/reg that allows the pump to not deadhead and overheat.
 
The truck pictured in my avatar has a carter vane style pump that is over 20yo. It has a now discontinued 24-104 spin on filter before it. You need a large filter before the pump not a parts store disposable fwiw.
 
M92PV4U said:
What size filter? Does it stop running or pumping?
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the carter just stopped alltogether. the edelbrocks keep humming but stop pumping. I've tried the filters that come with the edelbrock and i've gone without a filter all together with them with same results. The carter I used a generic silver store filter
 
Twankie said:
What pumps have you tried? Filters? As m92pv4u asked. Carb size? Does your “383 stroker” really need a ton of fuel?

i haven’t found a decent low pressure return style adjustable regulator but for stockish applications I have had good luck using a cj7 filter/reg that allows the pump to not deadhead and overheat.
Click to expand...

I had a facet lift pump that lasted a year but the gas disintegrated the plastic bowl. It couldn't supply enough gas though. I've put several red edelbrock (with and witout filter) And now a Carter P4594 with a generic silver store filter. the carb is a 600cfm. I have a fuel regulator with a return line on it. we thought that was the problem at one point
 
M92PV4U said:
Yes, but not we are using 33109 wix and perma cool 4794 mount. I'm not sure if these will work for a car though due to size.
I'd make sure that the pumps are compatible with your fuel.
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I've had the same issue with or witout the filter so I don't think that is the issue. I'm just running pump gas. I just picked up a Holley red pump. I'll try running it without prefilter. Thinking about bypassing the fuel regulator also. Only other thing in the loop I can think of
 
I've used this filter no regulator on my 454 600cfm Holly with a factory diaphragm pump with no return line port with no problem. Does it run good otherwise?
I killed a carter because the rubber line from my sending unit to the pump had a hole in it everything was fine until high rpms under a load and the pump couldn't keep up and the truck would cut out until the pump could catch up. I fixed that then shortly after the pump went out.
Edit: forgot this filter is what I used for the return line.
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M92PV4U said:
I've used this filter no regulator on my 454 600cfm Holly with a factory diaphragm pump with no return line port with no problem. Does it run good otherwise?
I killed a carter because the rubber line from my sending unit to the pump had a hole in it everything was fine until high rpms under a load and the pump couldn't keep up and the truck would cut out until the pump could catch up. I fixed that then shortly after the pump went out.
Edit: forgot this filter is what I used for the return line.
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ran great till the pump quit.
does the red holley need a return line?
 
kbenz said:
metal. gas flows freely to where the pump is mounted
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put a clear glass filter in front of the pump, look for bubbles to ensure you are not getting air into the system.

what is the model number for the holley? do they come back to life after they cool off?
 
mobil1syn said:
put a clear glass filter in front of the pump, look for bubbles to ensure you are not getting air into the system.

what is the model number for the holley? do they come back to life after they cool off?
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the holley I just put on is a 6145-2 Red . First time I've tried one of these.
I'll try and find a clear filter tomorrow. I've only found them at auto zone and they have been out lately
 
i dont want to sound like i am talking down to you, just walking through the steps i would do if i was in your shoes when the pump 'stops' working, ensuring its a pump issue and not a running issue.
- did you pull the discharge hose off at the pump to see if anything comes out?
- did you crack the fitting at the carb?
- did you check voltage at the pump?
- is the relay hot?
- was the pump hot?
- was it still making noise?
- have you tried using the pump to circulate fuel in a bucket?
- do you have adequate venting on the tank? you could be causing enough vacuum to stop flow to the pump
- make sure the tube in the tank is in good shape, if its cracked or damaged you may start pulling air half way through a tank
- get a pressure gauge at and put it at the carb and at the outlet of the pump
- are there any soft lines pinched? i had a buddy who's dmax was going lean, turns out a hose go pinched when he put his fancy giant tank in.

all the documentation i can find says a regulator is not needed. id open up a pump and see whats inside and grab a rebuild kit. its not working, the only thing that can happen is you make it work again. its making 7psi so it couldnt be that complicated in there
 
mobil1syn said:
i dont want to sound like i am talking down to you, just walking through the steps i would do if i was in your shoes when the pump 'stops' working, ensuring its a pump issue and not a running issue.
- did you pull the discharge hose off at the pump to see if anything comes out? "edelbrock yes. carter no. pump quit altogether"
- did you crack the fitting at the carb? "no"
- did you check voltage at the pump? "previously yes"
- is the relay hot? "didn't think to check that"
- was the pump hot? "seemed pretty warm. not sure how warm they should get really"
- was it still making noise? "edelbrock yes. carter no"
- have you tried using the pump to circulate fuel in a bucket? "have in the past with edelbrock. "
- do you have adequate venting on the tank? you could be causing enough vacuum to stop flow to the pump. "tank vent seems fine"
- make sure the tube in the tank is in good shape, if its cracked or damaged you may start pulling air half way through a tank. "gonna try the clear filter"
- get a pressure gauge at and put it at the carb and at the outlet of the pump
- are there any soft lines pinched? i had a buddy who's dmax was going lean, turns out a hose go pinched when he put his fancy giant tank in. " I have looked before but have not seen any"

all the documentation i can find says a regulator is not needed. id open up a pump and see whats inside and grab a rebuild kit. its not working, the only thing that can happen is you make it work again. its making 7psi so it couldnt be that complicated in there
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I tried answering the questions in the quote above. I don't feel you are talking down to me. I'm not a total mechanical idiot but this has me feeling like a stooge. It'll probably end up being something embarrasingly simple. (I hope)
 
put the holley red pump on. found a clear filter. filled up the tank. drove 10 miles. (no bubbles in filter before or after putting gas in.) top of pump where wires go in was very warm but the bottom was cool. relay was almost hot. checked fan and headlight relay's (just to see) and they were cold
 
kbenz said:
put the holley red pump on. found a clear filter. filled up the tank. drove 10 miles. (no bubbles in filter before or after putting gas in.) top of pump where wires go in was very warm but the bottom was cool. relay was almost hot. checked fan and headlight relay's (just to see) and they were cold
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get someone to give it 1/2, 3/4 and WOT throttle while you check for bubbles.
 
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