Electric Fuel Pump Conversion

[ronskydivepops]

Anyone have good advice for switched out my mechanical fuel pump with an electric fuel pump? I just got my GT back on the road a few weeks ago and whenever I floor the accelerator it increases speed but starts sputtering as if it's getting fuel starved. When I back off the gas it goes back to running normal, and this only seems to happen when I really floor it. I can cruise around at 100 mph with no problem with normal accelleration. Thanks for any help!

[MICAH1]

Try this ....... Carter is a good name and price.

http://www.rockauto.com/catalog/cata...&parttype=6256

[benncojr]

Ron,
Before the Mods talk about using the search button take a look at this thread.

http://www.opelgt.com/forums/showthr...tric+Fuel+Pump

I think this will answer a lot of your questions.

[ronskydivepops]

Thanks for all your help gang. Now I'm more confused than ever. Just kidding! It is amazing that with just asking one question you can find all kinds of information that may cause current or future problems in a GT from people on this site. You are all a wealth of knowledge. I think the Carter pump should solve my problem. The answers have also reminded me of all the other components that could give me a problem also. Thanks again Ron

[tekenaar]

Ron,
Before the Mods talk about using the search button take a look at this thread.

http://www.opelgt.com/forums/showthr...tric+Fuel+Pump

I think this will answer a lot of your questions.

. . . check your carb bowl fuel level, i.e. float setting and the float (fuel logged?) itself . . . If these are not correct, replacing the fuel pump, either mechanical or electric, will not help!!

[hrcollinsjr]

whenever I floor the accelerator it increases speed but starts sputtering

Does' it fall on its face and then recover? If so I would check the accelerator pump and nozzle. On occasion I've had the diapraghm fail or the nozzle get blocked.

HTH,
Harold

[ronskydivepops]

The weber was new 4 1/2 years ago. Only driven it maybe 300 miles since it was new. I rebuilt it when I checked the float level within the past month. It doesn't fall on it's face so to speak. When I accelerate normally I can get up to any speed with no problem. When I push the pedal to the metal in third gear it will kick in the other barrel and you can hear the engine roar and zoom-off I go. After 3-5 seconds I can feel it start to bog down a bit, not completely, just enough to make me back off the gas out of instinct. It goes back to normal operation within 2-3 seconds. I"m thinking the fuel pump because I hear so much discussion about their downfalls, plus my see thru filter is sometimes full, sometimes half full, and sometimes empty!! The tank was resealed inside and the sock removed three years ago. No more vacuum leaks either. I had one at the intake and fixed that and checked and rechecked all vacuum connections. The engine is old (Original) and the compression is about as low as it can go,but it only smokes a wee bit. I use lead additive in the gas, and if I don't it runs like it's about to blow up and dies. Once I cycle in some more lead it goes back to running normal. My GT has a mind of it's own so no matter what I do it will do whatever it feels like. I don't mind though, keeps me on my toes wondering what I'll need to tinker with next. It really does think for itself. If I feel like I may need a wheel bearing then the exhaust will start rattling. When I check the exhaust(nothing wrong of course) then the seat will stick. If I don't drive her for a week I swear I can hear her weeping late at night. Maybe I've parked too close to my bed!!

[spdkilz02]

i think i might be getting the carter for my manta...prolly will help the 2.0 and dual 40's...

[tekenaar]

The weber was new 4 1/2 years ago. Only driven it maybe 300 miles since it was new. I rebuilt it when I checked the float level within the past month. It doesn't fall on it's face so to speak. When I accelerate normally I can get up to any speed with no problem. When I push the pedal to the metal in third gear it will kick in the other barrel and you can hear the engine roar and zoom-off I go. After 3-5 seconds I can feel it start to bog down a bit, not completely, just enough to make me back off the gas out of instinct. It goes back to normal operation within 2-3 seconds. I"m thinking the fuel pump because I hear so much discussion about their downfalls, plus my see thru filter is sometimes full, sometimes half full, and sometimes empty!! The tank was resealed inside and the sock removed three years ago. No more vacuum leaks either. I had one at the intake and fixed that and checked and rechecked all vacuum connections. The engine is old (Original) and the compression is about as low as it can go,but it only smokes a wee bit. I use lead additive in the gas, and if I don't it runs like it's about to blow up and dies. Once I cycle in some more lead it goes back to running normal. My GT has a mind of it's own so no matter what I do it will do whatever it feels like. I don't mind though, keeps me on my toes wondering what I'll need to tinker with next. It really does think for itself. If I feel like I may need a wheel bearing then the exhaust will start rattling. When I check the exhaust(nothing wrong of course) then the seat will stick. If I don't drive her for a week I swear I can hear her weeping late at night. Maybe I've parked too close to my bed!!

Absolutely no reason the stock fuel pump shouldn't be able to keep the fuel bowl in the carb filled, especially on a 'stock' engine, as long as the fuel tank is VENTED properly!!!! If not vented, you'll build up vacuum in tank which will reduce fuel volume available at pump intake. Fuel pumps are NOT designed to suck, they are designed to pressurize as long as sufficient volume is supplied at their inlet . . . less volume at inlet (vacuum in tank), less volume to pressurize and bowl empties under high demand conditions . . . WOT (Wide Open Throttle).

[nobody]

Sorry but I've seen too many fuel pumps die at the worst times. unless you feel like carying a spare and want to dive into the motor at midnight in Lord knows what town, ditch it. You can get an electric one in pretty much every city in the world, try buying an Opel pump and not be stranded for a while. I've had it happen in Juneau, Alberta BC and El Paso. Different cars but it still wasn't fun. Usually that's one of the first things to hit the garbage bin on any build.

[ronskydivepops]

Sounds like I may want to check the gas tank vent. I replaced all the tubing and the sending unit when I redid the tank, but that was well over 3 1/2 years ago when I first started this project. I think I'm definitely going to give the carter fuel pump a try and may as well try out the petronixs ignition too. Thanks for your help everyone, now I've got to go buy the parts and get my GT in the mood for some elective surgery!!

[Wolf Spyder]

Okay, I guess that this is now on my list of things to do. What about the plate to cover the old pump location, where do you get one?

[ronskydivepops]

I was wondering the same thing last night and forgot to mention it. I imagine we could just remove the guts out of the old mechanical pump and bolt it back on with a new gasket, seems like it would be okay.

[soybean]

OGTS has the block off plate that you need, part nos. 9041, here.
http://www.opelgtsource.com/catalog/...words=info.htm HTH, Jarrell

[nobody]

Or just cut one out of steel or aluminum plate using a gasket as a template.

[tekenaar]

Okay, I guess that this is now on my list of things to do. What about the plate to cover the old pump location, where do you get one?

Using pump phenolic spacer or pump gasket as template, fabricate one out of aluminum.

[Bo Mows]

I have installed an electric fuel pump rated max 4lb on my '69 GT. I have the oil pressure cutoff switch wired. My question is do i have to have a pressure regulator for my pump? If so what kind. I have a 34/36 Weber water choke carb. I have mounted the pump in the rear next to the tank with a filter and another see thru filter at the carb. Before i gutted the car to restore, i had it running out of a plastic gas tank just for timing and tuning before winter. What is recommended for a regulator if needed?

Bo

[tekenaar]

I have installed an electric fuel pump rated max 4lb on my '69 GT. I have the oil pressure cutoff switch wired. My question is do i have to have a pressure regulator for my pump? If so what kind. I have a 34/36 Weber water choke carb. I have mounted the pump in the rear next to the tank with a filter and another see thru filter at the carb. Before i gutted the car to restore, i had it running out of a plastic gas tank just for timing and tuning before winter. What is recommended for a regulator if needed?

Bo

What pump are you using? If you're sure (tested it?) pump doesn't produce more than 4 PSI, no regulator is needed.

[Bo Mows]

Facet EFP-3. I have not tested it, other than running the engine for a short time. I just made sure that when i got it from NAPA it was rated 1 - 4 PSI.

Bo