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Maybe hookup a temp fuel pressure line at the carb and put the gauge temp somewhere where you can see it when the car falls off?

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or if you have jets you can jet it up 2 or
3 jet sizes... if it does the same thing its more than
likely a supply issue

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Maybe hookup a temp fuel pressure line at the carb and put the gauge temp somewhere where you can see it when the car falls off?

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or if you have jets you can jet it up 2 or
3 jet sizes... if it does the same thing its more than
likely a supply issue

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I rarely post in the race forum but I think this the best place for this one...

I think I have a fuel starvation issue. I am running a carter M6903 with 3/8 fuel line through a 40 micron Russell in line filter from on my 500 inch stroker motor. Stock style fuel tank and pickup. Carb is a Quickfuel 830. It pulls fine up until about 4000 RPM and then it falls flat and bogs down completely until I let off the throttle.
Like I said I think it’s a fuel issue but maybe I’m wrong. If it is a fuel issue where do I start troubleshooting? How do I check a mechanical pump? I don’t have a fuel pressure gauge in the car, just one on the carb.

Thanks
Ken

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Sure sounds like a fuel delivery problem. in my humble opinion everything you have is way to small for a 500 inch motor. you also might have another self-inflicted problem. If I were you, I would cut open my oil filter, and get a magnifying glass, and look in the pleats for brass. If it is there, time to put new bearings in it. Inadequate fuel delivery will cause a lean condition, which can take out bearings. not saying that it has happened yet, just saying you should look at it.

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I would think that the pump/line setup is your issue...A stock tank pickup with a 3/8" line and a mech pump pulling for fuel is asking alot to supply a 500cu.in. motor with a big carb. I would suggest a small electric pump (Like a Holley Blue) to push the fuel up to the mech pump. Install a regulator between the pumps to limit pressure to 6.5-7.0 lbs. This will insure constent fuel supply to the mech. pump..It is better to push the fuel rather than pull it...This will correct you problem and wiring the pump t the ignition will make it as stock as possible. (No switches to remember to turn on).I have seen this problem several times on street/strip cars...poppaj

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I would think that the pump/line setup is your issue...A stock tank pickup with a 3/8" line and a mech pump pulling for fuel is asking alot to supply a 500cu.in. motor with a big carb. I would suggest a small electric pump (Like a Holley Blue) to push the fuel up to the mech pump. Install a regulator between the pumps to limit pressure to 6.5-7.0 lbs. This will insure constent fuel supply to the mech. pump..It is better to push the fuel rather than pull it...This will correct you problem and wiring the pump t the ignition will make it as stock as possible. (No switches to remember to turn on).I have seen this problem several times on street/strip cars...poppaj

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Sounds like this is where I will be headed, is my (all new) 3/8 line big enough? Holly wants the regulator by the carb. I assume that you suggest putting it between the pumps because my mechanical dosen't require a regulator and we don't want the electic fuel pump over powering the mechanical pump?

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I would think that the pump/line setup is your issue...A stock tank pickup with a 3/8" line and a mech pump pulling for fuel is asking alot to supply a 500cu.in. motor with a big carb. I would suggest a small electric pump (Like a Holley Blue) to push the fuel up to the mech pump. Install a regulator between the pumps to limit pressure to 6.5-7.0 lbs. This will insure constent fuel supply to the mech. pump..It is better to push the fuel rather than pull it...This will correct you problem and wiring the pump t the ignition will make it as stock as possible. (No switches to remember to turn on).I have seen this problem several times on street/strip cars...poppaj

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Sounds like this is where I will be headed, is my (all new) 3/8 line big enough? Holly wants the regulator by the carb. I assume that you suggest putting it between the pumps because my mechanical dosen't require a regulator and we don't want the electic fuel pump over powering the mechanical pump?

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I would think that the pump/line setup is your issue...A stock tank pickup with a 3/8" line and a mech pump pulling for fuel is asking alot to supply a 500cu.in. motor with a big carb. I would suggest a small electric pump (Like a Holley Blue) to push the fuel up to the mech pump. Install a regulator between the pumps to limit pressure to 6.5-7.0 lbs. This will insure constent fuel supply to the mech. pump..It is better to push the fuel rather than pull it...This will correct you problem and wiring the pump t the ignition will make it as stock as possible. (No switches to remember to turn on).I have seen this problem several times on street/strip cars...poppaj

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Sounds like this is where I will be headed, is my (all new) 3/8 line big enough? Holly wants the regulator by the carb. I assume that you suggest putting it between the pumps because my mechanical dosen't require a regulator and we don't want the electic fuel pump over powering the mechanical pump?

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I would advise you to throw the mechanical pump in the trash and replace it with a BG HR220 electric pump. This pump has a return style regulator which is needed for street driving. Using an electric to feed a mechanical is not a good idea. If the diaphram in the mechanical fails you could get fuel pumped directly into your motor. I don't use cam driven mechanical pumps for anything.

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