Fuel pump location - Team Camaro Tech
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post #1 of 10 (permalink) Old Dec 29th, 10, 01:21 PM Thread Starter
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Fuel pump location

I currently have a in tank fuel pump. Walbro 255. However last summer I overheated the fuel and the pump was pumping bubbles a few times. Now I have relocated the Fuel lines, the regulator, installed a fuel radiator etc to minimize heat. The pump works until the car warms up, then I get vapor lock or the pump is just getting ready to die. The fuel gage at the throttle body goes from 45 psi to 20 and the engine dies. I dont think it is vapor lock because the fuel lines feel cool enough as does the regulator. So I am thinking the pump is going bad. I purchased a like new original tank from a guy with a Z28 and it is awesome. I also bought a new dual piped/sending unit that goes in the stock hole. I was thinking of going back to a stock tank and mounting an external tank. Probably make a bracket to hold it and mount it right outside the front of the tank. Or is it OK to mount the fuel pump up front on the outer subframe? It would be lower than the tank. This has been an ongoing issue for me and put a major damper on my cruising last summer. I really want to fix it this winter.

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post #2 of 10 (permalink) Old Dec 29th, 10, 02:01 PM
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Re: Fuel pump location

The in-tank pump will push fuel better than sucking fuel from the tank.
Why not replace the in-tank pump? Fuel line routing after the pump shouldn't make a difference.

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post #3 of 10 (permalink) Old Dec 29th, 10, 04:06 PM Thread Starter
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Re: Fuel pump location

Well I thought about that but I have had problems with them and I am hoping the externals are more reliable. The in tanl\k caused me to cut a hole in the trunk and I want to go back to the standard tank. Weld up the hole in the trunk. I found a sender from ROBBMC with 1/2" pipes with AN8 fitting on them. This way I can use a standard tank with a aeromotive A1000 Fuel Pump. This is what I am thinking at this point.

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69 Camaro, Air Ride Suspension,
Procharged HO 454, 700R4, 12 bolt with Yukon axles, 3:73 gears posi, Pypes 2.5" X pipe with Borla XS mufflers. Retrotek Speed EFI, Ridetech suspension.
Rushforth rated X with Toyo tires. MSD 6 ignition.
Wilwood 6 piston Dynalite disc brakes with Hydratech booster.
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post #4 of 10 (permalink) Old Dec 29th, 10, 04:14 PM
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Re: Fuel pump location

I believe the plan is a good fix.

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post #5 of 10 (permalink) Old Dec 29th, 10, 04:28 PM
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Re: Fuel pump location

If you use the aeromotive pump be sure to get the speed controller. I was going that route and Frank at Prodigy talked me out of it. He said wayyyyyyy to many problems with those pumps. That Walbro is a heck of a good pump. The only idea I have about the pressure dropping besides acutal pump failing would be an electrical issue...such as grounding problem , etc. You may want to check voltage at the connection before and after the pressure drops.

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post #6 of 10 (permalink) Old Dec 29th, 10, 05:20 PM
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Re: Fuel pump location

Quote:
Originally Posted by Denvervet View Post
If you use the aeromotive pump be sure to get the speed controller. I was going that route and Frank at Prodigy talked me out of it. He said wayyyyyyy to many problems with those pumps. That Walbro is a heck of a good pump. The only idea I have about the pressure dropping besides acutal pump failing would be an electrical issue...such as grounding problem , etc. You may want to check voltage at the connection before and after the pressure drops.
Hmmm, A1000 huh? I've got one of those. Had it three years. It's only failed ONCE. Wish me luck.
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Just add me to the list Frank.

Oh Man! Forgot.
The A1000 fittings are proprietary. You gotta use their stuff. It looks like AN but it's theirs and costs a lot.

See the black things between the filters and pumps? That's those nasty swivels that are Aeromotive only. Hell, so is all the rest of those parts. Be warned.

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post #7 of 10 (permalink) Old Dec 29th, 10, 05:36 PM Thread Starter
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Re: Fuel pump location

Interesting info on the aeromotive pump. Maybe I will rethink my strategy. Maybe an external walbro mounted like freds. Any other good external pumps out there? One other tidbit. I never had a problem until I installed the pro charger and was told I needed to move the regulator up in he engine bay. Seems the heat in the engine bay is warming up the fuel and recirculating it to the tank. I have thought about putting the regulator back at the tank also.

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69 Camaro, Air Ride Suspension,
Procharged HO 454, 700R4, 12 bolt with Yukon axles, 3:73 gears posi, Pypes 2.5" X pipe with Borla XS mufflers. Retrotek Speed EFI, Ridetech suspension.
Rushforth rated X with Toyo tires. MSD 6 ignition.
Wilwood 6 piston Dynalite disc brakes with Hydratech booster.
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post #8 of 10 (permalink) Old Dec 29th, 10, 05:51 PM
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Re: Fuel pump location

I am using a Holley inline pump (HOL12-90) mounted just in front of the tank, Had it about 6 months with no problems, real quiet, it was about $200.00 from Grand Prix Autosports.
Scott


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post #9 of 10 (permalink) Old Dec 29th, 10, 07:35 PM
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Re: Fuel pump location

https://www.camaros.net/forums/showthread.php?t=140637

I researched the piss out of this... post above is what I did. So far so good. Pumps are OK outside of the tank but work best when in-tank...

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post #10 of 10 (permalink) Old Dec 30th, 10, 06:23 AM Thread Starter
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Re: Fuel pump location

Looks like Mallory and Paxton have some descent In lines. Anybody have any experience with these? As a next step I may try to re-install my regulator back near the tank or I may go to my latest design since I already have a new old tank that is untouched and use the RobbMC sender with an external pump. Decisions, decisions. No hurry now, we are about to get a storm in Denver. We have had 50 degree days all through the Holidays.

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69 Camaro, Air Ride Suspension,
Procharged HO 454, 700R4, 12 bolt with Yukon axles, 3:73 gears posi, Pypes 2.5" X pipe with Borla XS mufflers. Retrotek Speed EFI, Ridetech suspension.
Rushforth rated X with Toyo tires. MSD 6 ignition.
Wilwood 6 piston Dynalite disc brakes with Hydratech booster.
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