[DeTomaso] More time to plan

[Tomas Gunnarsson]

Regarding the electric fuel pump I installed one a few years ago. I had suspected poor fuel pressure so I installed a pressure gauge and found the pressure good at idle and decreasing to 1-2 psi at 5k or so rpm. I borrowed a used but low mileage pump from Thomas T and saw the same symptoms. I suspect that the excenter inside is somehow not properly set up. Rather than pulling the timing cover I installed an electric pump. It came with rubber mounts to isolate from noise but even so it was very noticeable from the drivers seat when I turned on the ignition. When I start the engine nothing can be heard of the pump. The fuel pressure is now stable through the rpm range. When I pull the engine I'll investigate if a mechanical pump can be installed again as I appreciate the simplicity of a mechanical pump but for now I'm happy with the electric pump. I have also eliminated what I think was vapor lock that would occur with extended idling/very slow stop and go driving. Of course with the slighly different fuel line routing with the electric pump I can't say for sure what did the trick. Theoretically an electric fuel pump should be almost immune to vapor lock as it simply keeps pumping at max capacity until the vapor bubble is gone.

Tomas
----- Original Message ----- 
From: <MikeLDrew at aol.com>
To: <boyd411 at gmail.com>; <detomaso at realbig.com>
Sent: Monday, June 08, 2009 4:18 AM
Subject: Re: [DeTomaso] More time to plan


> In a message dated 6/7/09 8 01 12, boyd411 at gmail.com writes:
> 
> 
>> I fell off of my roof while cleaning the leaves out of the gutters on
>> thursday evening. I was trying to get back from the roof to the ladder 
>> when
>> the ladder collapsed. I wound up with a broken Tibea and I an lucky I 
>> didn't
>> break my neck or back. 
>> 
>>>>Indeed!   I for one am very glad to hear that your injuries aren't more 
> serious--for they easily could have been.
> 
> A pilot in my squadron had to fly back to his parent's house in Tennessee a 
> couple of months ago, because his father was cleaning the leaves out of the 
> gutters, and fell off the ladder and wound up in the hospital.   So, my 
> buddy flew home, and started taking on the job himself, and HE fell off the 
> same ladder, shattered his elbow, broke ribs, punctured a lung, was in the 
> hospital for awhile, had to have major reconstructive surgery, and will now have 
> limited mobility in his arm, and as a result, he will never be allowed to 
> fly an airplane again. :<(
> 
> Moral of the story--just let the damn water fall where it wants to! :>)
>> 
>> >Trying to remain the eternal
>> optomist I am lucky not to be dead or crippled with a broken neck or back.
>> 
>>>>Exactly right.   And like I said, I'm glad to hear it!
> 
> 
>> Now I have more time to put into the car. And on that subject I am 
>> looking
>> for opinions on roller rockers ann the advantages or disadvantages of 
>> going
>> with an electrical fuel pump with a carb. Is there an advantage over a
>> simple mechanical fuel pump ?
>> 
>>>>Others will weigh in on the advantages of roller rockers.   With respect 
> to an electric fuel pump, I would offer that there is no real advantage on 
> a car with a simple carburetor, and they come with several disadvantages, 
> including annoying noise (most of them are VERY loud), and potential for 
> failure due to electrical issues.
> 
> If your engine can use a mechanical pump (some can't for various reasons, 
> including fuel injected engines), then I'd stick with it.   
> 
> It ain't broke, don't fix it.
> 
> Cheers!
> 
> Mike
> 
> 
> 
> **************
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